diff --git a/addons/web/common/dispatch.py b/addons/web/common/dispatch.py
index 57e45fa594e..fdcdb92118b 100644
--- a/addons/web/common/dispatch.py
+++ b/addons/web/common/dispatch.py
@@ -98,7 +98,8 @@ class WebRequest(object):
         self.params = dict(params)
         # OpenERP session setup
         self.session_id = self.params.pop("session_id", None) or uuid.uuid4().hex
-        self.session = self.httpsession.setdefault(self.session_id, session.OpenERPSession(self.config))
+        self.session = self.httpsession.setdefault(self.session_id, session.OpenERPSession())
+        self.session.config = self.config
         self.context = self.params.pop('context', None)
         self.debug = self.params.pop('debug', False) != False
 
diff --git a/addons/web/common/session.py b/addons/web/common/session.py
index a7bbd865073..2ed50bd6131 100644
--- a/addons/web/common/session.py
+++ b/addons/web/common/session.py
@@ -29,8 +29,8 @@ class OpenERPSession(object):
         Used to store references to non-literal domains which need to be
         round-tripped to the client browser.
     """
-    def __init__(self, config):
-        self.config = config
+    def __init__(self):
+        self.config = None
         self._db = False
         self._uid = False
         self._login = False
@@ -38,6 +38,12 @@ class OpenERPSession(object):
         self.context = {}
         self.contexts_store = {}
         self.domains_store = {}
+        
+    def __getstate__(self):
+        state = dict(self.__dict__)
+        if "config" in state:
+            del state['config']
+        return state
 
     def build_connection(self):
         conn = openerplib.Connection(self.config.connector, database=self._db, login=self._login,