From 03512f2aecc27a3800d8d22031d6a663245d83d0 Mon Sep 17 00:00:00 2001
From: Miguel Grinberg <miguel.grinberg@gmail.com>
Date: Mon, 2 Sep 2024 20:10:30 +0100
Subject: [PATCH] prevent crash when client sends empty event

---
 src/flask_socketio/namespace.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/flask_socketio/namespace.py b/src/flask_socketio/namespace.py
index 43833a9b..8c447f5f 100644
--- a/src/flask_socketio/namespace.py
+++ b/src/flask_socketio/namespace.py
@@ -17,7 +17,7 @@ def trigger_event(self, event, *args):
         method can be overridden if special dispatching rules are needed, or if
         having a single method that catches all events is desired.
         """
-        handler_name = 'on_' + event
+        handler_name = 'on_' + (event or '')
         if not hasattr(self, handler_name):
             # there is no handler for this event, so we ignore it
             return