diff --git a/apps/bym.js b/apps/bym.js
index 6a73551..208aa18 100644
--- a/apps/bym.js
+++ b/apps/bym.js
@@ -68,7 +68,7 @@ export class bym extends plugin {
     let card = e.sender.card || e.sender.nickname
     let group = e.group_id
     let prop = Math.floor(Math.random() * 100)
-    if (e.msg?.includes(Config.assistantLabel)) {
+    if (Config.assistantLabel && e.msg?.includes(Config.assistantLabel)) {
       prop = prop / 100
     }
     if (e.msg?.endsWith('？')) {