--- a/src/pyams_security/utility.py	Wed Jun 26 11:14:21 2019 +0200
+++ b/src/pyams_security/utility.py	Thu Jul 02 09:09:57 2020 +0200
@@ -15,6 +15,7 @@
 import logging
 from functools import lru_cache
 
+from ZODB.POSException import ConnectionStateError
 from beaker.cache import cache_region
 from pyramid.authentication import AuthTktCookieHelper
 from pyramid.decorator import reify
@@ -25,8 +26,9 @@
 from zope.interface import implementer
 from zope.schema.fieldproperty import FieldProperty
 
-from pyams_security.interfaces import AuthenticatedPrincipalEvent, IAuthenticationPlugin, ICredentialsPlugin, \
-    IDirectoryPlugin, IGroupsAwareDirectoryPlugin, IProtectedObject, ISecurityManager
+from pyams_security.interfaces import AuthenticatedPrincipalEvent, IAuthenticationPlugin, \
+    ICredentialsPlugin, IDirectoryPlugin, IGroupsAwareDirectoryPlugin, IProtectedObject, \
+    ISecurityManager
 from pyams_security.principal import MissingPrincipal, UnknownPrincipal
 from pyams_utils.registry import query_utility
 from pyams_utils.request import check_request, request_property
@@ -265,7 +267,11 @@
             return principal_id
         manager = self._get_security_manager(request)
         if manager is not None:
-            return manager.authenticated_userid(request)
+            try:
+                return manager.authenticated_userid(request)
+            except ConnectionStateError:
+                pass
+        return None
 
     @request_property(key=None)
     def effective_principals(self, request, context=None):