diff --git a/server.py b/server.py
index 1e471dceb26f1041427af4d1d341d7422db7a25f..7386eef5aa8cc2a158996e49d0769d09bb7caa86 100644
--- a/server.py
+++ b/server.py
@@ -236,7 +236,7 @@ def handle_errors(endpoint, text, code, *errors, **epargs):
 
 @app.errorhandler(404)
 @app.route('/invalidpath')
-def handle_not_found(e):
+def handle_not_found(e=None):
 	return render_endpoint('index', 'Diese Seite existiert nicht!'), 404
 
 @app.errorhandler(500)