Fixed the autorejoin bug with overlimited MUC. Fixes #5678

src/common/connection_handlers.py

@@ -1767,6 +1767,7 @@ ConnectionCaps, ConnectionHandlersBase, ConnectionJingle):
                     self.dispatch('NOTIFY', (jid_stripped, 'error', errmsg, resource,
                             prio, keyID, timestamp, None))
                 elif (errcode == '503'):
+                    if gc_control is None or gc_control.autorejoin is None:
                         # maximum user number reached
                         self.dispatch('ERROR', (_('Unable to join group chat'),
                                 _('Maximum number of users for %s has been reached') % \