fix

httpdocs/src/Controller/BackendController.php

@@ -147,7 +147,7 @@ class BackendController extends AbstractController
                             "`unique_user`='$unique_users',".
                             "`page_impressions`='$page_impressions',".
                             "`visits`='$visits',".
-                            "`source`= $source".
+                            "`source`='$source'".
                             " WHERE `id` = $id"
                     );
                 }