- Patch #1476776 by droplet: drupal_var_export() is a concatination to undefined variable .

core/includes/utility.inc

@@ -51,7 +51,7 @@ function drupal_var_export($var, $prefix = '') {
     // magic method __set_state() leaving the export broken. This
     // workaround avoids this by casting the object as an array for
     // export and casting it back to an object when evaluated.
-    $output .= '(object) ' . drupal_var_export((array) $var, $prefix);
+    $output = '(object) ' . drupal_var_export((array) $var, $prefix);
   }
   else {
     $output = var_export($var, TRUE);