diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 3aa01cff047..1eacdbf0942 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -101,7 +101,7 @@ def ensure_db(redirect='/web/database/selector'):
     # If the db is taken out of a query parameter, it will be checked against
     # `http.db_filter()` in order to ensure it's legit and thus avoid db
     # forgering that could lead to xss attacks.
-    db = request.params.get('db')
+    db = request.params.get('db') and request.params.get('db').strip()
 
     # Ensure db is legit
     if db and db not in http.db_filter([db]):