Index: genshi/index.php
===================================================================
--- genshi/index.php	(revision 3f4661fc579d7c2e949fb5135c93391554256f56)
+++ genshi/index.php	(revision 18050d88638760fe82515afde470994c5f569e48)
@@ -31,4 +31,5 @@
     }
     if (!strlen(trim($_POST['source']))) {
+        if(! isset($_POST['language'])) { $_POST['language'] = 'php'; }
         $_POST['language'] = preg_replace('#[^a-zA-Z0-9\-_]#', '', $_POST['language']);
         $_POST['source'] = implode('', @file($path . 'geshi/' . $_POST['language'] . '.php'));