diff --git a/extensions/feishu/src/dedupe-key.test.ts b/extensions/feishu/src/dedupe-key.test.ts
index f3603f0d8075..a41d1b98ac1f 100644
--- a/extensions/feishu/src/dedupe-key.test.ts
+++ b/extensions/feishu/src/dedupe-key.test.ts
@@ -64,6 +64,13 @@ describe("resolveFeishuMessageDedupeKey", () => {
     expect(key).toBe("om_no_time");
   });
 
+  it("falls back to message_id for malformed create_time", () => {
+    const key = resolveFeishuMessageDedupeKey(
+      textEvent({ messageId: "om_bad_time", createTime: "1710000000000ms" }),
+    );
+    expect(key).toBe("om_bad_time");
+  });
+
   it("keeps media keyed by message_id plus media key", () => {
     const event: FeishuMessageEvent = {
       sender: { sender_id: { open_id: "ou-user" } },
diff --git a/extensions/feishu/src/dedupe-key.ts b/extensions/feishu/src/dedupe-key.ts
index 1c4ffe0688e7..4e657a9b653b 100644
--- a/extensions/feishu/src/dedupe-key.ts
+++ b/extensions/feishu/src/dedupe-key.ts
@@ -1,5 +1,6 @@
 // Feishu plugin module implements dedupe key behavior.
 import { createHash } from "node:crypto";
+import { parseStrictNonNegativeInteger } from "openclaw/plugin-sdk/number-runtime";
 import { asNullableRecord as readRecord } from "openclaw/plugin-sdk/string-coerce-runtime";
 import type { FeishuMessageEvent } from "./event-types.js";
 import { normalizeFeishuExternalKey } from "./external-keys.js";
@@ -79,7 +80,12 @@ function resolveTextRetryDedupeKey(event: FeishuMessageDedupeInput): string | un
   const createTime = event.message.create_time?.trim();
   const chatId = event.message.chat_id?.trim();
   const senderId = resolveSenderIdentity(event);
-  if (!createTime || !chatId || !senderId) {
+  if (
+    !createTime ||
+    parseStrictNonNegativeInteger(createTime) === undefined ||
+    !chatId ||
+    !senderId
+  ) {
     return undefined;
   }
   const contentHash = createHash("sha256")