diff --git a/index.php b/index.php
index a4bc734..e289cdc 100644
--- a/index.php
+++ b/index.php
@@ -8,7 +8,7 @@ $outputLogin = null;
 $outputEmail = null;
 $class=null;
 $title = null;
-$message = null;
+$message = "";    // checkRequest() erwartet einen string
 $saved = false;