diff --git a/src/main/resources/views/layouts/platform.html b/src/main/resources/views/layouts/platform.html
index b95517b..000902a 100644
--- a/src/main/resources/views/layouts/platform.html
+++ b/src/main/resources/views/layouts/platform.html
@@ -241,7 +241,7 @@
                     window.onunload = () => {
                         const _gap_time = new Date().getTime() - _beforeUnload_time
                         if (_gap_time <= 5) {
-                            this.ws.send({
+                            this.send({
                                 room: "${@auth.getPrincipalProperty('loginname')}:${@auth.getSessionId()}",
                                 action: "left"
                             })