Locked chat function from double entry.

owrx/client.py

@@ -35,6 +35,7 @@ class ClientRegistry(object):
         self.chat = {}
         self.chatCount = 1
         self.chatColors = ColorCache()
+        self.chatLock = threading.Lock()
         Config.get().wireProperty("max_clients", self._checkClientCount)
         super().__init__()
 
@@ -71,6 +72,7 @@ class ClientRegistry(object):
 
     # Broadcast chat message to all connected clients.
     def broadcastChatMessage(self, client, text: str, name: str = None):
+        with self.chatLock:
             if name is not None:
                 # Names can only include alphanumerics
                 name = re.sub("\W+", "", name)