From 3e136fc57a2e509e5a4dd265a798b196205b0a80 Mon Sep 17 00:00:00 2001
From: Marvin W <git@larma.de>
Date: Sun, 4 Oct 2026 22:02:19 +0200
Subject: Fix more warnings

---
 xmpp-vala/src/module/xep/0004_data_forms.vala      |  5 --
 .../module/xep/0030_service_discovery/module.vala  | 17 +++++--
 xmpp-vala/src/module/xep/0084_user_avatars.vala    |  9 ++--
 .../xep/0261_jingle_in_band_bytestreams.vala       |  4 --
 xmpp-vala/src/module/xep/0272_muji.vala            | 10 ++--
 .../src/module/xep/0363_http_file_upload.vala      | 36 ++++++++-------
 .../module/xep/0388_extensible_sasl_profile.vala   | 24 ++++++----
 .../module/xep/0392_consistent_color/hsluv.vala    | 53 ++++++++++------------
 xmpp-vala/src/module/xep/0410_muc_self_ping.vala   | 18 +++++---
 .../src/module/xep/0425_message_moderation.vala    | 18 +++++---
 .../module/xep/0447_stateless_file_sharing.vala    |  2 +-
 .../0490_message_displayed_synchronization.vala    | 37 ++++++++++-----
 12 files changed, 133 insertions(+), 100 deletions(-)

(limited to 'xmpp-vala/src/module/xep')

diff --git a/xmpp-vala/src/module/xep/0004_data_forms.vala b/xmpp-vala/src/module/xep/0004_data_forms.vala
index f481e174..6c16a53d 100644
--- a/xmpp-vala/src/module/xep/0004_data_forms.vala
+++ b/xmpp-vala/src/module/xep/0004_data_forms.vala
@@ -83,11 +83,6 @@ public class DataForm {
             value_node.put_node(new StanzaNode.text(val));
         }
 
-        internal void add_value_string(string val) {
-            StanzaNode node = new StanzaNode.build("value");
-            node.put_node(new StanzaNode.text(val));
-        }
-
         internal Gee.List<Option>? get_options() {
             Gee.List<Option> ret = new ArrayList<Option>();
             Gee.List<StanzaNode> option_nodes = node.get_subnodes("option", NS_URI);
diff --git a/xmpp-vala/src/module/xep/0030_service_discovery/module.vala b/xmpp-vala/src/module/xep/0030_service_discovery/module.vala
index 1ba8ac3a..20666820 100644
--- a/xmpp-vala/src/module/xep/0030_service_discovery/module.vala
+++ b/xmpp-vala/src/module/xep/0030_service_discovery/module.vala
@@ -53,10 +53,14 @@ public class Module : XmppStreamModule, Iq.Handler {
             active_info_requests[jid] = future;
 
             Iq.Stanza iq = new Iq.Stanza.get(new StanzaNode.build("query", NS_URI_INFO).add_self_xmlns()) { to=jid };
-            Iq.Stanza iq_response = yield stream.get_module(Iq.Module.IDENTITY).send_iq_async(stream, iq);
-            InfoResult? result = InfoResult.create_from_iq(iq_response);
-
-            promise.set_value(result);
+            try {
+                Iq.Stanza iq_response = yield stream.get_module(Iq.Module.IDENTITY).send_iq_async(stream, iq);
+                InfoResult? result = InfoResult.create_from_iq(iq_response);
+
+                promise.set_value(result);
+            } catch (IOError e) {
+                promise.set_exception(e);
+            }
             active_info_requests.unset(jid);
         }
 
@@ -64,6 +68,11 @@ public class Module : XmppStreamModule, Iq.Handler {
             InfoResult? res = yield future.wait_async();
             return res;
         } catch (FutureError error) {
+            if (error is FutureError.EXCEPTION) {
+                if (future.exception is IOError) {
+                    throw (IOError) future.exception;
+                }
+            }
             warning("Future error when waiting for info request result: %s", error.message);
             return null;
         }
diff --git a/xmpp-vala/src/module/xep/0084_user_avatars.vala b/xmpp-vala/src/module/xep/0084_user_avatars.vala
index 76ad824b..4e96dd8f 100644
--- a/xmpp-vala/src/module/xep/0084_user_avatars.vala
+++ b/xmpp-vala/src/module/xep/0084_user_avatars.vala
@@ -20,9 +20,12 @@ namespace Xmpp.Xep.UserAvatars {
         stream.get_module(Pubsub.Module.IDENTITY).publish.begin(stream, null, NS_URI_METADATA, sha1, metadata_node);
     }
 
-    public void unset_avatar(XmppStream stream) {
-        StanzaNode metadata_node = new StanzaNode.build("metadata", NS_URI_METADATA).add_self_xmlns();
-        stream.get_module(Pubsub.Module.IDENTITY).delete_node(stream, null, NS_URI_METADATA);
+    public void unset_avatar(XmppStream stream, string? hash = null) {
+        var pubsub_module = stream.get_module(Pubsub.Module.IDENTITY);
+        pubsub_module.delete_node(stream, null, NS_URI_METADATA);
+        if (hash != null) {
+            pubsub_module.retract_item.begin(stream, null, NS_URI_DATA, hash, (_, res) => pubsub_module.retract_item.end(res));
+        }
     }
 
     public async Bytes? fetch_image(XmppStream stream, Jid jid, string hash) throws IOError {
diff --git a/xmpp-vala/src/module/xep/0261_jingle_in_band_bytestreams.vala b/xmpp-vala/src/module/xep/0261_jingle_in_band_bytestreams.vala
index 09eaf711..09134a61 100644
--- a/xmpp-vala/src/module/xep/0261_jingle_in_band_bytestreams.vala
+++ b/xmpp-vala/src/module/xep/0261_jingle_in_band_bytestreams.vala
@@ -65,10 +65,6 @@ class Parameters : Jingle.TransportParameters, Object {
         return new Parameters(Jingle.Role.RESPONDER, peer_full_jid, sid, block_size);
     }
 
-    public string transport_ns_uri() {
-        return NS_URI;
-    }
-
     public void set_content(Jingle.Content content) {
 
     }
diff --git a/xmpp-vala/src/module/xep/0272_muji.vala b/xmpp-vala/src/module/xep/0272_muji.vala
index 7fd0da19..b287295c 100644
--- a/xmpp-vala/src/module/xep/0272_muji.vala
+++ b/xmpp-vala/src/module/xep/0272_muji.vala
@@ -56,9 +56,13 @@ namespace Xmpp.Xep.Muji {
                 muji_node.put_node(content_node);
             }
 
-            Presence.Stanza presence_stanza = new Presence.Stanza() { to=muc_jid.with_resource(group_call.our_nick) };
-            presence_stanza.stanza.put_node(muji_node);
-            stream.get_module(Presence.Module.IDENTITY).send_presence(stream, presence_stanza);
+            try {
+                Presence.Stanza presence_stanza = new Presence.Stanza() { to=muc_jid.with_resource(group_call.our_nick) };
+                presence_stanza.stanza.put_node(muji_node);
+                stream.get_module(Presence.Module.IDENTITY).send_presence(stream, presence_stanza);
+            } catch (InvalidJidError e) {
+                error("Group call participant jid was invalid: %s", e.message);
+            }
 
             return group_call;
         }
diff --git a/xmpp-vala/src/module/xep/0363_http_file_upload.vala b/xmpp-vala/src/module/xep/0363_http_file_upload.vala
index cba422ba..bd82109b 100644
--- a/xmpp-vala/src/module/xep/0363_http_file_upload.vala
+++ b/xmpp-vala/src/module/xep/0363_http_file_upload.vala
@@ -117,24 +117,28 @@ public class Module : XmppStreamModule {
     public override string get_id() { return IDENTITY.id; }
 
     private async void query_availability(XmppStream stream) {
-        ServiceDiscovery.InfoResult? info_result = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_info(stream, stream.remote_name);
-        bool available = check_ns_in_info(stream, stream.remote_name, info_result);
-        if (!available) {
-            ServiceDiscovery.ItemsResult? items_result = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_items(stream, stream.remote_name);
-            if (items_result == null) return;
-
-            for (int i = 0; i < 2; i++) {
-                foreach (Xep.ServiceDiscovery.Item item in items_result.items) {
-
-                    // First try the promising items and only afterwards all the others
-                    bool promising_upload_item = item.jid.to_string().has_prefix("upload");
-                    if ((i == 0 && !promising_upload_item) || (i == 1) && promising_upload_item) continue;
-
-                    ServiceDiscovery.InfoResult? info_result2 = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_info(stream, item.jid);
-                    bool available2 = check_ns_in_info(stream, item.jid, info_result2);
-                    if (available2) return;
+        try {
+            ServiceDiscovery.InfoResult? info_result = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_info(stream, stream.remote_name);
+            bool available = check_ns_in_info(stream, stream.remote_name, info_result);
+            if (!available) {
+                ServiceDiscovery.ItemsResult? items_result = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_items(stream, stream.remote_name);
+                if (items_result == null) return;
+
+                for (int i = 0; i < 2; i++) {
+                    foreach (Xep.ServiceDiscovery.Item item in items_result.items) {
+
+                        // First try the promising items and only afterwards all the others
+                        bool promising_upload_item = item.jid.to_string().has_prefix("upload");
+                        if ((i == 0 && !promising_upload_item) || (i == 1) && promising_upload_item) continue;
+
+                        ServiceDiscovery.InfoResult? info_result2 = yield stream.get_module(ServiceDiscovery.Module.IDENTITY).request_info(stream, item.jid);
+                        bool available2 = check_ns_in_info(stream, item.jid, info_result2);
+                        if (available2) return;
+                    }
                 }
             }
+        } catch (IOError e) {
+            warning("Error querying file upload availability: %s", e.message);
         }
     }
 
diff --git a/xmpp-vala/src/module/xep/0388_extensible_sasl_profile.vala b/xmpp-vala/src/module/xep/0388_extensible_sasl_profile.vala
index 1c6afb30..54d00482 100644
--- a/xmpp-vala/src/module/xep/0388_extensible_sasl_profile.vala
+++ b/xmpp-vala/src/module/xep/0388_extensible_sasl_profile.vala
@@ -43,19 +43,27 @@ namespace Xmpp.Xep.ExtensibleSaslProfile {
                     stream.expect_further_negotiation_stanzas = true;
 
                     var authorisation_identifier = node.get_subnode("authorization-identifier", NS_URI);
-                    string jid_string = authorisation_identifier.get_string_content();
-                    Jid jid = Jid.from_string(jid_string);
+                    string jid_string = authorisation_identifier != null ? authorisation_identifier.get_string_content() : "";
+                    try {
+                        Jid jid = Jid.from_string(jid_string);
 
-                    foreach (var inline_provider in inline_activation_providers.values) {
-                        inline_provider.on_bound(stream, jid, node);
+                        foreach (var inline_provider in inline_activation_providers.values) {
+                            inline_provider.on_bound(stream, jid, node);
+                        }
+                    } catch (InvalidJidError e) {
+                        warning("Server provided invalid authorization-identifier \"%s\": %s", jid_string, e.message);
                     }
                 } else if (node.name == "challenge" && stream.has_flag(Flag.IDENTITY)) {
                     Flag flag = stream.get_flag(Flag.IDENTITY);
                     if (flag.mechanism == Mechanism.SCRAM_SHA_1) {
-                        var challenge_response = compute_challenge_response(node.get_string_content(), flag.password, flag.client_nonce, flag.name);
-                        flag.server_signature = challenge_response.expected_server_signature;
-                        stream.write(new StanzaNode.build("response", NS_URI).add_self_xmlns()
-                                .put_node(new StanzaNode.text(Base64.encode((uchar[]) (challenge_response.response).to_utf8()))));
+                        try {
+                            var challenge_response = compute_challenge_response(node.get_string_content(), flag.password, flag.client_nonce, flag.name);
+                            flag.server_signature = challenge_response.expected_server_signature;
+                            stream.write(new StanzaNode.build("response", NS_URI).add_self_xmlns()
+                                    .put_node(new StanzaNode.text(Base64.encode((uchar[]) (challenge_response.response).to_utf8()))));
+                        } catch (Error e) {
+                            warning("Error computing challenge response: %s", e.message);
+                        }
                     }
                 } else if (node.name == "failure") {
                     stream.remove_flag(stream.get_flag(Flag.IDENTITY));
diff --git a/xmpp-vala/src/module/xep/0392_consistent_color/hsluv.vala b/xmpp-vala/src/module/xep/0392_consistent_color/hsluv.vala
index 10aa5d9f..9efe0970 100644
--- a/xmpp-vala/src/module/xep/0392_consistent_color/hsluv.vala
+++ b/xmpp-vala/src/module/xep/0392_consistent_color/hsluv.vala
@@ -1,4 +1,4 @@
-namespace Hsluv {
+namespace Xmpp.Xep.ConsistentColor.Hsluv {
 
 private const double[] M0 = {  3.240969941904521, -1.537383177570093, -0.498610760293    };
 private const double[] M1 = { -0.96924363628087, 1.87596750150772, 0.041555057407175 };
@@ -8,10 +8,6 @@ private const double[] MInv0 = { 0.41239079926595, 0.35758433938387, 0.180480788
 private const double[] MInv1 = { 0.21263900587151, 0.71516867876775, 0.072192315360733 };
 private const double[] MInv2 = { 0.019330818715591, 0.11919477979462, 0.95053215224966  };
 
-private double RefX = 0.95045592705167;
-private double RefY = 1.0;
-private double RefZ = 1.089057750759878;
-
 private double RefU = 0.19783000664283;
 private double RefV = 0.46831999493879;
 
@@ -129,22 +125,19 @@ private double to_linear(double c) {
 }
 
 private int[] rgb_prepare(double[] tuple) {
-    for (int i = 0; i < tuple.length; ++i) {
-        tuple[i] = round(tuple[i], 3);
-    }
-
-    for (int i = 0; i < tuple.length; ++i) {
-        double ch = tuple[i];
-
-        if (ch < -0.0001 || ch > 1.0001) {
-            return null; //throw new Error("Illegal rgb value: " + ch);
-                }
-    }
-
     var results = new int[tuple.length];
 
     for (int i = 0; i < tuple.length; ++i) {
-        results[i] = (int) Math.round(tuple[i] * 255);
+        double ch = round(tuple[i], 3);
+        if (ch < -0.0001) {
+            warning("RGB value underflow: %f", tuple[i]);
+            results[i] = 0;
+        } else if (ch > 1.0001) {
+            warning("RGB value overflow: %f", tuple[i]);
+            results[i] = 255;
+        } else {
+            results[i] = (int) Math.round(ch * 255);
+        }
     }
 
     return results;
@@ -174,17 +167,17 @@ internal double[] rgb_to_xyz(double[] tuple) {
 
 private double y_to_l(double Y) {
     if (Y <= Epsilon) {
-        return (Y / RefY) * Kappa;
+        return Y * Kappa;
     } else {
-        return 116 * Math.pow(Y / RefY, 1.0 / 3.0) - 16;
+        return 116 * Math.pow(Y, 1.0 / 3.0) - 16;
     }
 }
 
 private double l_to_y(double L) {
     if (L <= 8) {
-        return RefY * L / Kappa;
+        return L / Kappa;
     } else {
-        return RefY * Math.pow((L + 16) / 116, 3);
+        return Math.pow((L + 16) / 116, 3);
     }
 }
 
@@ -356,37 +349,37 @@ internal double[] rgb_to_lch(double[] tuple) {
 
 // Rgb <--> Hsluv(p)
 
-internal double[] hsluv_to_rgb(double[] tuple) {
+public double[] hsluv_to_rgb(double[] tuple) {
     return lch_to_rgb(hsluv_to_lch(tuple));
 }
 
-internal double[] rgb_to_hsluv(double[] tuple) {
+public double[] rgb_to_hsluv(double[] tuple) {
     return lch_to_hsluv(rgb_to_lch(tuple));
 }
 
-internal double[] hpluv_to_rgb(double[] tuple) {
+public double[] hpluv_to_rgb(double[] tuple) {
     return lch_to_rgb(hpluv_to_lch(tuple));
 }
 
-internal double[] rgb_to_hpluv(double[] tuple) {
+public double[] rgb_to_hpluv(double[] tuple) {
     return lch_to_hpluv(rgb_to_lch(tuple));
 }
 
 // Hex
 
-internal string hsluv_to_hex(double[] tuple) {
+public string hsluv_to_hex(double[] tuple) {
     return rgb_to_hex(hsluv_to_rgb(tuple));
 }
 
-internal string hpluv_to_hex(double[] tuple) {
+public string hpluv_to_hex(double[] tuple) {
     return rgb_to_hex(hpluv_to_rgb(tuple));
 }
 
-internal double[] hex_to_hsluv(string s) {
+public double[] hex_to_hsluv(string s) {
     return rgb_to_hsluv(hex_to_tgb(s));
 }
 
-internal double[] hex_to_hpluv(string s) {
+public double[] hex_to_hpluv(string s) {
     return rgb_to_hpluv(hex_to_tgb(s));
 }
 
diff --git a/xmpp-vala/src/module/xep/0410_muc_self_ping.vala b/xmpp-vala/src/module/xep/0410_muc_self_ping.vala
index 84772333..6511789e 100644
--- a/xmpp-vala/src/module/xep/0410_muc_self_ping.vala
+++ b/xmpp-vala/src/module/xep/0410_muc_self_ping.vala
@@ -1,16 +1,20 @@
 namespace Xmpp.Xep.MucSelfPing {
 
     public static async bool is_joined(XmppStream stream, Jid jid) {
-        Iq.Stanza iq_result = yield stream.get_module(Xmpp.Xep.Ping.Module.IDENTITY).send_ping(stream, jid);
+        try {
+            Iq.Stanza iq_result = yield stream.get_module(Xmpp.Xep.Ping.Module.IDENTITY).send_ping(stream, jid);
 
-        if (!iq_result.is_error()) {
-            return true;
-        } else {
-            var error_stanza = iq_result.get_error();
-            if (error_stanza.condition in new string[] {ErrorStanza.CONDITION_SERVICE_UNAVAILABLE, ErrorStanza.CONDITION_FEATURE_NOT_IMPLEMENTED}) {
-                // the client is joined, but the pinged client does not implement XMPP Ping
+            if (!iq_result.is_error()) {
                 return true;
+            } else {
+                var error_stanza = iq_result.get_error();
+                if (error_stanza.condition in new string[] {ErrorStanza.CONDITION_SERVICE_UNAVAILABLE, ErrorStanza.CONDITION_FEATURE_NOT_IMPLEMENTED}) {
+                    // the client is joined, but the pinged client does not implement XMPP Ping
+                    return true;
+                }
             }
+        } catch (IOError e) {
+            // Ignoring, same as if ping failed
         }
         return false;
     }
diff --git a/xmpp-vala/src/module/xep/0425_message_moderation.vala b/xmpp-vala/src/module/xep/0425_message_moderation.vala
index 80fab905..934e5ff3 100644
--- a/xmpp-vala/src/module/xep/0425_message_moderation.vala
+++ b/xmpp-vala/src/module/xep/0425_message_moderation.vala
@@ -7,13 +7,17 @@ namespace Xmpp.Xep.MessageModeration {
      * @return whether the moderation was successful
      */
     public static async bool moderate(XmppStream stream, Jid muc_jid, string message_id) {
-        StanzaNode moderate_node = new StanzaNode.build("moderate", NS_URI)
-                .add_self_xmlns()
-                .put_attribute("id", message_id)
-                .put_node(new StanzaNode.build("retract", Xep.MessageRetraction.NS_URI).add_self_xmlns());
-        Iq.Stanza iq = new Iq.Stanza.set(moderate_node) { to = muc_jid };
+        try {
+            StanzaNode moderate_node = new StanzaNode.build("moderate", NS_URI)
+                    .add_self_xmlns()
+                    .put_attribute("id", message_id)
+                    .put_node(new StanzaNode.build("retract", Xep.MessageRetraction.NS_URI).add_self_xmlns());
+            Iq.Stanza iq = new Iq.Stanza.set(moderate_node) { to = muc_jid };
 
-        Iq.Stanza result_stanza = yield stream.get_module(Iq.Module.IDENTITY).send_iq_async(stream, iq);
-        return !result_stanza.is_error();
+            Iq.Stanza result_stanza = yield stream.get_module(Iq.Module.IDENTITY).send_iq_async(stream, iq);
+            return !result_stanza.is_error();
+        } catch (IOError e) {
+            return false;
+        }
     }
 }
\ No newline at end of file
diff --git a/xmpp-vala/src/module/xep/0447_stateless_file_sharing.vala b/xmpp-vala/src/module/xep/0447_stateless_file_sharing.vala
index 86da6a3a..7e9b12ba 100644
--- a/xmpp-vala/src/module/xep/0447_stateless_file_sharing.vala
+++ b/xmpp-vala/src/module/xep/0447_stateless_file_sharing.vala
@@ -5,7 +5,7 @@ namespace Xmpp.Xep.StatelessFileSharing {
 
     public const string NS_URI = "urn:xmpp:sfs:0";
 
-    public static Gee.List<FileShare> get_file_shares(MessageStanza message) {
+    public static Gee.List<FileShare>? get_file_shares(MessageStanza message) {
         var ret = new ArrayList<FileShare>();
         foreach (StanzaNode file_sharing_node in message.stanza.get_subnodes("file-sharing", NS_URI)) {
             var metadata = Xep.FileMetadataElement.get_file_metadata(file_sharing_node);
diff --git a/xmpp-vala/src/module/xep/0490_message_displayed_synchronization.vala b/xmpp-vala/src/module/xep/0490_message_displayed_synchronization.vala
index 38437735..b129c571 100644
--- a/xmpp-vala/src/module/xep/0490_message_displayed_synchronization.vala
+++ b/xmpp-vala/src/module/xep/0490_message_displayed_synchronization.vala
@@ -10,15 +10,19 @@ namespace Xmpp.Xep.MessageDisplayedSynchronization {
 
         private void handle_displayed_node_item(XmppStream stream, string? id, StanzaNode? item) {
             if (id == null || item == null) return;
-            Jid conversation_jid = Jid.from_string(id);
-            StanzaNode? stanza_id_node = item.get_subnode("stanza-id", UniqueStableStanzaIDs.NS_URI);
-            if (stanza_id_node == null || stanza_id_node.get_attribute("by") == null || stanza_id_node.get_attribute("id") == null) return;
-            Jid stanza_id_by_jid = Jid.from_string(stanza_id_node.get_attribute("by"));
-            string stanza_id = stanza_id_node.get_attribute("id");
-            if (stream.has_flag(Flag.IDENTITY)) {
-                stream.get_flag(Flag.IDENTITY).learn_mds(conversation_jid, stanza_id_by_jid, stanza_id);
+            try {
+                Jid conversation_jid = Jid.from_string(id);
+                StanzaNode? stanza_id_node = item.get_subnode("stanza-id", UniqueStableStanzaIDs.NS_URI);
+                if (stanza_id_node == null || stanza_id_node.get_attribute("by") == null || stanza_id_node.get_attribute("id") == null) return;
+                Jid stanza_id_by_jid = Jid.from_string(stanza_id_node.get_attribute("by"));
+                string stanza_id = stanza_id_node.get_attribute("id");
+                if (stream.has_flag(Flag.IDENTITY)) {
+                    stream.get_flag(Flag.IDENTITY).learn_mds(conversation_jid, stanza_id_by_jid, stanza_id);
+                }
+                on_message_displayed(conversation_jid, stanza_id_by_jid, stanza_id);
+            } catch (InvalidJidError e) {
+                warning("Received mds item with invalid jid, ignoring: %s", e.message);
             }
-            on_message_displayed(conversation_jid, stanza_id_by_jid, stanza_id);
         }
 
         private void on_pubsub_item(XmppStream stream, Jid jid, string id, StanzaNode? item) {
@@ -32,9 +36,13 @@ namespace Xmpp.Xep.MessageDisplayedSynchronization {
         private void on_initial_presence_sent(XmppStream stream) {
             var pubsub = stream.get_module(Pubsub.Module.IDENTITY);
             pubsub.request_all.begin(stream, null, NS_URI, (_, res) => {
-                Gee.List<StanzaNode>? items = pubsub.request_all.end(res);
-                foreach (StanzaNode node_item in items) {
-                    handle_displayed_node_item(stream, node_item.get_attribute("id"), node_item.get_subnode("displayed", NS_URI));
+                try {
+                    Gee.List<StanzaNode>? items = pubsub.request_all.end(res);
+                    foreach (StanzaNode node_item in items) {
+                        handle_displayed_node_item(stream, node_item.get_attribute("id"), node_item.get_subnode("displayed", NS_URI));
+                    }
+                } catch (IOError e) {
+                    warning("Failed requesting initial mds set: %s", e.message);
                 }
             });
         }
@@ -50,7 +58,12 @@ namespace Xmpp.Xep.MessageDisplayedSynchronization {
                     .set_max_items("max")
                     .set_send_last_published_item("never")
                     .set_access_model("whitelist");
-            return yield pubsub.publish(stream, stream.get_flag(Bind.Flag.IDENTITY).my_jid.bare_jid, NS_URI, conversation_jid.to_string(), node, options);
+            try {
+                return yield pubsub.publish(stream, stream.get_flag(Bind.Flag.IDENTITY).my_jid.bare_jid, NS_URI, conversation_jid.to_string(), node, options);
+            } catch (IOError e) {
+                warning("Failed publishing mds item: %s", e.message);
+                return false;
+            }
         }
 
         public override void attach(XmppStream stream) {
-- 
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