diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 2876114ccaf..bf4e2aaa0fc 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1098,6 +1098,7 @@ class Database(http.Controller):
             if not re.match(DBNAME_PATTERN, new_name):
                 raise Exception(_('Invalid database name. Only alphanumerical characters, underscore, hyphen and dot are allowed.'))
             dispatch_rpc('db', 'duplicate_database', [master_pwd, name, new_name])
+            request._cr = None  # duplicating a database leads to an unusable cursor
             return http.local_redirect('/web/database/manager')
         except Exception as e:
             error = "Database duplication error: %s" % (str(e) or repr(e))