--- a/server/session.py	Fri Mar 12 15:05:33 2010 +0100
+++ b/server/session.py	Fri Mar 12 16:11:56 2010 +0100
@@ -741,6 +741,7 @@
                 self.error('thread %s still alive after 10 seconds, will close '
                            'session anyway', thread)
         self.rollback()
+        del self._threaddata
 
     # transaction data/operations management ##################################