diff --git a/plugin/index.ts b/plugin/index.ts
index 1de1e3a..ddbb311 100644
--- a/plugin/index.ts
+++ b/plugin/index.ts
@@ -805,7 +805,8 @@ export default {
 
     // Handle NO_REPLY detection before message write
     // This is where we detect if agent output is NO_REPLY and handle turn advancement
-    api.on("before_message_write", async (event, ctx) => {
+    // NOTE: This hook is synchronous, do not use async/await
+    api.on("before_message_write", (event, ctx) => {
       try {
         const key = ctx.sessionKey;
         const channelId = ctx.channelId as string | undefined;
@@ -859,12 +860,14 @@ export default {
           return;
         }
 
-        // Trigger moderator handoff message
+        // Trigger moderator handoff message (fire-and-forget, don't await)
         if (live.moderatorBotToken) {
           const nextUserId = resolveDiscordUserId(api, nextSpeaker);
           if (nextUserId) {
             const handoffMsg = `轮到（<@${nextUserId}>）了，如果没有想说的请直接回复NO_REPLY`;
-            sendModeratorMessage(live.moderatorBotToken, channelId, handoffMsg, api.logger);
+            void sendModeratorMessage(live.moderatorBotToken, channelId, handoffMsg, api.logger).catch((err) => {
+              api.logger.warn(`whispergate: before_message_write handoff failed: ${String(err)}`);
+            });
           } else {
             api.logger.warn(`whispergate: cannot resolve Discord userId for next speaker accountId=${nextSpeaker}`);
           }