--- a/frontends/primitivus/contact_list.py	Sat Jul 31 00:32:51 2010 +0800
+++ b/frontends/primitivus/contact_list.py	Sat Jul 31 00:34:05 2010 +0800
@@ -124,11 +124,12 @@
     def clear_contacts(self):
         """clear all the contact list"""
         self.groups={}
+        self.selected = None
 
     def replace(self, jid, groups=[None]):
         """add a contact to the list if doesn't exist, else update it"""
-        assert groups.__class__ == list
-        assert jid.__class__ == JID
+        assert isinstance(groups, list)
+        assert isinstance(jid, JID)
         if not groups:
             groups=[None]
         for group in groups: