From 3a071bdd08b8a0a47d27fc1def5be917dab0370c Mon Sep 17 00:00:00 2001
From: Stephen Paul Weber <singpolyma@singpolyma.net>
Date: Mon, 30 Oct 2023 11:00:31 -0500
Subject: [PATCH] Need to synchronize all presences access

---
 .../siacs/conversations/entities/Presences.java   | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/main/java/eu/siacs/conversations/entities/Presences.java b/src/main/java/eu/siacs/conversations/entities/Presences.java
index e32e7e7a005b8f8b7b98ca721e701a64c7cd76a4..f625ddd965bd4327feefe72f393512c89a311955 100644
--- a/src/main/java/eu/siacs/conversations/entities/Presences.java
+++ b/src/main/java/eu/siacs/conversations/entities/Presences.java
@@ -150,15 +150,16 @@ public class Presences {
     }
 
     public String firstWhichSupport(final String namespace) {
-        for (Map.Entry<String, Presence> entry : this.presences.entrySet()) {
-            String resource = entry.getKey();
-            Presence presence = entry.getValue();
-            ServiceDiscoveryResult disco = presence.getServiceDiscoveryResult();
-            if (disco != null && disco.getFeatures().contains(namespace)) {
-                return resource;
+        synchronized (this.presences) {
+            for (Map.Entry<String, Presence> entry : this.presences.entrySet()) {
+                String resource = entry.getKey();
+                Presence presence = entry.getValue();
+                ServiceDiscoveryResult disco = presence.getServiceDiscoveryResult();
+                if (disco != null && disco.getFeatures().contains(namespace)) {
+                    return resource;
+                }
             }
         }
-
         return null;
     }