diff --git a/doc/contents.php b/doc/contents.php
index f101a467ab4..3bba4629896 100755
--- a/doc/contents.php
+++ b/doc/contents.php
@@ -5,7 +5,8 @@
     if (! $info = document_file("files.php", false)) {
         error("404 - File Not Found");
     }
-
+
+    $string = array();
     if ($CFG->forcelogin) {
         require_login();
     }