diff --git a/htdocs/caldav.php b/htdocs/caldav.php
index 8b83e9d7..5c4bdb45 100644
--- a/htdocs/caldav.php
+++ b/htdocs/caldav.php
@@ -154,7 +154,7 @@ try {
   }
 
 } catch (Exception $e) {
-  trace_bug('DAViCal Fatal Error');
+  trace_bug( 'DAViCal Fatal Error: ['.$e->getCode().'] '.$e->getmessage().' at '.$e->getFile().':'.$e->getLine() );
   $request->DoResponse( 500, translate('DAViCal Fatal Error') );
 }