diff --git a/lib/zdb/zdb.class.php b/lib/zdb/zdb.class.php
index ada9e7c19b..1d8ba14ac7 100644
--- a/lib/zdb/zdb.class.php
+++ b/lib/zdb/zdb.class.php
@@ -383,8 +383,12 @@ class zdb
             $result = array();
             foreach($data as $item)
             {
-                if(is_string($item)) $result[] = addslashes($item);
-                if(is_null($item)) $result[] = null;
+                if(is_string($item))
+                    $result[] = addslashes($item);
+                elseif(is_null($item))
+                    $result[] = null;
+                else
+                    $result[] = $item;
             }
             return $result;
         }