diff --git a/rhodecode/subscribers.py b/rhodecode/subscribers.py
--- a/rhodecode/subscribers.py
+++ b/rhodecode/subscribers.py
@@ -95,7 +95,7 @@ def add_request_user_context(event):
     request.user = auth_user
     request.user_auth_token = auth_token
     request.environ['rc_auth_user'] = auth_user
-    request.environ['rc_auth_user_id'] = auth_user.user_id
+    request.environ['rc_auth_user_id'] = str(auth_user.user_id)
     request.environ['rc_req_id'] = req_id