diff -r 3674f249ab1d -r e32964e28a45 server/session.py
--- a/server/session.py	Thu Jul 24 14:52:16 2014 +0200
+++ b/server/session.py	Fri Jul 25 16:24:44 2014 +0200
@@ -532,8 +532,7 @@
     def __exit__(self, exctype=None, excvalue=None, tb=None):
         assert self._open # actually already open
         assert self._cnxset_count == 0
-        self._free_cnxset(ignoremode=True)
-        self.clear()
+        self.rollback()
         self._open = False