diff --git a/extension/qfq/qfq/helper/Sanitize.php b/extension/qfq/qfq/helper/Sanitize.php
index 67e48f248daf370e6048defade3d8ae1b0493ebf..ae7b939ab23170ce73c09fafc1aa4f8fe4910d8b 100644
--- a/extension/qfq/qfq/helper/Sanitize.php
+++ b/extension/qfq/qfq/helper/Sanitize.php
@@ -143,7 +143,7 @@ class Sanitize {
             SANITIZE_ALLOW_MIN_MAX => '',
             SANITIZE_ALLOW_MIN_MAX_DATE => '',
             SANITIZE_ALLOW_PATTERN => '',
-            SANITIZE_ALLOW_ALLBUT => '^[^\[\]{}%&\\#]+$',
+            SANITIZE_ALLOW_ALLBUT => '^[^\[\]{}%&\\#]*$',
             SANITIZE_ALLOW_ALL => '.*'
         ];
     }