diff --git a/extensions/feishu/src/monitor.comment.test.ts b/extensions/feishu/src/monitor.comment.test.ts
index 09136e86916..198919d5575 100644
--- a/extensions/feishu/src/monitor.comment.test.ts
+++ b/extensions/feishu/src/monitor.comment.test.ts
@@ -308,6 +308,18 @@ describe("resolveDriveCommentEventTurn", () => {
 
     expect(turn).toBeNull();
   });
+
+  it("skips comment notices when bot open_id is unavailable", async () => {
+    const synthetic = await resolveDriveCommentSyntheticEvent({
+      cfg: buildMonitorConfig(),
+      accountId: "default",
+      event: makeDriveCommentEvent(),
+      botOpenId: undefined,
+      createClient: () => makeOpenApiClient({}) as never,
+    });
+
+    expect(synthetic).toBeNull();
+  });
 });
 
 describe("drive.notice.comment_add_v1 monitor handler", () => {
diff --git a/extensions/feishu/src/monitor.comment.ts b/extensions/feishu/src/monitor.comment.ts
index 764e3b18258..a906bbcb332 100644
--- a/extensions/feishu/src/monitor.comment.ts
+++ b/extensions/feishu/src/monitor.comment.ts
@@ -479,6 +479,13 @@ async function resolveDriveCommentEventCore(params: ResolveDriveCommentEventPara
     logger?.(`feishu[${accountId}]: unsupported drive comment notice type ${noticeType}`);
     return null;
   }
+  if (!botOpenId) {
+    logger?.(
+      `feishu[${accountId}]: skipping drive comment notice because bot open_id is unavailable ` +
+        `event=${eventId}`,
+    );
+    return null;
+  }
   if (senderId === botOpenId) {
     logger?.(
       `feishu[${accountId}]: ignoring self-authored drive comment notice event=${eventId} sender=${senderId}`,