diff --git a/src/tabs.py b/src/tabs.py
index 023c9cf3..734efb74 100644
--- a/src/tabs.py
+++ b/src/tabs.py
@@ -396,6 +396,8 @@ class MucTab(ChatTab):
     def command_configure(self, arg):
         form = self.core.xmpp.plugin['xep_0045'].getRoomForm(self.get_name())
         self.core.information('%s' % form)
+        if not form:
+            return
         self.core.open_new_form(form, self.cancel_config, self.send_config)
 
     def cancel_config(self, form):