diff --git a/js/script.js b/js/script.js
index 1b48aa6..1722521 100644
--- a/js/script.js
+++ b/js/script.js
@@ -243,6 +243,7 @@ function downloadFile(event) {
 
 function error(data, statut, error) {
   lock = 0;
+  console.log(data.status + " " + data.statusText);
   console.log(data);
   //$('body').html(data['status'] + ' ' + error + '<br>' + data['responseText']);
 };
diff --git a/upload.php b/upload.php
index ee8c3a9..16431ed 100644
--- a/upload.php
+++ b/upload.php
@@ -18,6 +18,12 @@ $file = $_FILES["file"];
 
 $name = basename($file["name"]);
 
+
+if (! extension_loaded('mbstring')) {
+	header("HTTP/1.1 400 Bad encode");
+	exit();
+}
+
 if(! mb_check_encoding($name)) {
 	header("HTTP/1.1 400 Bad encode");
 	exit();