diff -r c21b399c9269 -r c62c80f20a82 cubicweb/hooks/syncsession.py
--- a/cubicweb/hooks/syncsession.py	Fri Mar 10 12:07:29 2017 +0100
+++ b/cubicweb/hooks/syncsession.py	Fri Mar 10 18:24:40 2017 +0100
@@ -116,7 +116,6 @@
             # remove cached groups for the user
             key = user_session_cache_key(self.session.user.eid, 'groups')
             self.session.data.pop(key, None)
-            self.session.close()
         except BadConnectionId:
             pass  # already closed