diff --git a/classes/Autoload.php b/classes/Autoload.php
index 4b6e74ac6..8464f3bff 100644
--- a/classes/Autoload.php
+++ b/classes/Autoload.php
@@ -129,7 +129,10 @@ class Autoload
 		// Write classes index on disc to cache it
 		$filename = $this->root_dir.Autoload::INDEX_FILE;
 		if ((file_exists($filename) && !is_writable($filename)) || !is_writable(dirname($filename)))
-			throw new PrestaShopException($filename.' is not writable, please give write permissions (chmod 666) on this file.');
+		{
+			header('HTTP/1.1 503 temporarily overloaded');
+			die('/cache/class_index.php is not writable, please give write permissions (chmod 666) on this file.');
+		}
 		else
 		{
 			// Let's write index content in cache file