diff --git a/lib/base/filter/filter.class.php b/lib/base/filter/filter.class.php
index 86f57f8b92..f693a0cb6c 100644
--- a/lib/base/filter/filter.class.php
+++ b/lib/base/filter/filter.class.php
@@ -329,7 +329,7 @@ class baseValidater
      */
     public static function checkNotEmpty($var)
     {
-        return !empty($var);
+        return !empty($var) or $var === '0';
     }
 
     /**