diff --git a/sql.php b/sql.php
index 3a27eebc8..d5cbf0721 100755
--- a/sql.php
+++ b/sql.php
@@ -325,11 +325,10 @@ if (isset($GLOBALS['show_as_php']) || !empty($GLOBALS['validatequery'])) {
             /**
              * HTML header.
              */
-            if( $GLOBALS['is_ajax_request'] == true) {
-                PMA_ajaxResponse(NULL, false);
+            
+            if($GLOBALS['is_ajax_request'] != true) {
+                require_once './libraries/header.inc.php';
             }
-
-            require_once './libraries/header.inc.php';
             $full_err_url = (preg_match('@^(db|tbl)_@', $err_url))
                           ? $err_url . '&show_query=1&sql_query=' . urlencode($sql_query)
                           : $err_url;