synchronize around getting last visibile uuid

1 files changed, 14 insertions, 12 deletions

diff --git a/src/main/java/de/pixart/messenger/ui/ConversationFragment.java b/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
index bc3a7c890..0b399393d 100644
--- a/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
+++ b/src/main/java/de/pixart/messenger/ui/ConversationFragment.java
@@ -1858,20 +1858,22 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
         if (binding == null) {
             return null;
         }
-        int pos = binding.messagesView.getLastVisiblePosition();
-        if (pos >= 0) {
-            Message message = null;
-            for (int i = pos; i >= 0; --i) {
-                message = (Message) binding.messagesView.getItemAtPosition(i);
-                if (message.getType() != Message.TYPE_STATUS) {
-                    break;
+        synchronized (this.messageList) {
+            int pos = binding.messagesView.getLastVisiblePosition();
+            if (pos >= 0) {
+                Message message = null;
+                for (int i = pos; i >= 0; --i) {
+                    message = (Message) binding.messagesView.getItemAtPosition(i);
+                    if (message.getType() != Message.TYPE_STATUS) {
+                        break;
+                    }
                 }
-            }
-            if (message != null) {
-                while (message.next() != null && message.next().wasMergedIntoPrevious()) {
-                    message = message.next();
+                if (message != null) {
+                    while (message.next() != null && message.next().wasMergedIntoPrevious()) {
+                        message = message.next();
+                    }
+                    return message.getUuid();
                 }
-                return message.getUuid();
             }
         }
         return null;