diff --git a/lib/common.lib.php b/lib/common.lib.php
index 56fcaf226..0e0d4a472 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -1927,7 +1927,7 @@ function sql_real_escape_string($field)
 {
     global $g5;
 
-    if($field)
+    if($field != '')
         return mysql_real_escape_string($field, $g5['connect_db']);
 }