don't try to reconnect in a MUC when we get an error. Fixes #6097

src/gui_interface.py

@@ -306,6 +306,8 @@ class Interface:
             elif gc_control:
                 gc_control.print_conversation('Error %s: %s' % (obj.errcode,
                     obj.errmsg))
+            if gc_control and gc_control.autorejoin:
+                gc_control.autorejoin = False
 
     def handle_event_presence(self, obj):
         # 'NOTIFY' (account, (jid, status, status message, resource,