diff --git a/core/core.php b/core/core.php
index d1654a62..a816726f 100644
--- a/core/core.php
+++ b/core/core.php
@@ -777,8 +777,8 @@ class common
 				}
 			}
 		}
-		// Sinon retourne null
-		return null;
+		// Sinon retourne une chaine vide
+		return helper::filter(null, $filter);
 	}
 
 	/**