diff --git a/extensions/feishu/src/bot.checkBotMentioned.test.ts b/extensions/feishu/src/bot.checkBotMentioned.test.ts
index 197e5ba5aa2..00f20ad57be 100644
--- a/extensions/feishu/src/bot.checkBotMentioned.test.ts
+++ b/extensions/feishu/src/bot.checkBotMentioned.test.ts
@@ -140,6 +140,17 @@ describe("parseFeishuMessageEvent – mentionedBot", () => {
     expect(ctx.mentionedBot).toBe(false);
   });
 
+  it.each([undefined, "", "  "])(
+    "does not create mention-forward targets when botOpenId is %j",
+    (botOpenId) => {
+      const event = makeEvent("p2p", [
+        { key: "@_user_1", name: "Alice", id: { open_id: "ou_alice" } },
+      ]);
+      const ctx = parseFeishuMessageEvent(event, botOpenId);
+      expect(ctx.mentionTargets).toBeUndefined();
+    },
+  );
+
   it("returns mentionedBot=false when botOpenId is empty string (probe failed)", () => {
     const event = makeEvent("group", [
       { key: "@_user_1", name: "Alice", id: { open_id: "ou_alice" } },
diff --git a/extensions/feishu/src/bot.ts b/extensions/feishu/src/bot.ts
index 8f0b48ec469..a14d4dfcac2 100644
--- a/extensions/feishu/src/bot.ts
+++ b/extensions/feishu/src/bot.ts
@@ -319,8 +319,9 @@ export function parseFeishuMessageEvent(
   };
 
   // Detect mention forward request: message mentions bot + at least one other user
-  if (isMentionForwardRequest(event, botOpenId)) {
-    const mentionTargets = extractMentionTargets(event, botOpenId);
+  const mentionForwardBotOpenId = botOpenId?.trim();
+  if (mentionForwardBotOpenId && isMentionForwardRequest(event, mentionForwardBotOpenId)) {
+    const mentionTargets = extractMentionTargets(event, mentionForwardBotOpenId);
     if (mentionTargets.length > 0) {
       ctx.mentionTargets = mentionTargets;
     }
diff --git a/extensions/feishu/src/mention.ts b/extensions/feishu/src/mention.ts
index 5a567e3e32c..00eb3c3dbd4 100644
--- a/extensions/feishu/src/mention.ts
+++ b/extensions/feishu/src/mention.ts
@@ -28,7 +28,7 @@ export function isFeishuBroadcastMention(mention: FeishuMentionLike): boolean {
  */
 export function extractMentionTargets(
   event: FeishuMessageEvent,
-  botOpenId?: string,
+  botOpenId: string,
 ): MentionTarget[] {
   const mentions = event.message.mentions ?? [];
 
@@ -38,7 +38,7 @@ export function extractMentionTargets(
         return false;
       }
       // Exclude the bot itself
-      if (botOpenId && m.id.open_id === botOpenId) {
+      if (m.id.open_id === botOpenId) {
         return false;
       }
       // Must have open_id
@@ -62,17 +62,21 @@ export function isMentionForwardRequest(event: FeishuMessageEvent, botOpenId?: s
   if (mentions.length === 0) {
     return false;
   }
+  const normalizedBotOpenId = botOpenId?.trim();
+  if (!normalizedBotOpenId) {
+    return false;
+  }
 
   const isDirectMessage = !isFeishuGroupChatType(event.message.chat_type);
   const userMentions = mentions.filter((m) => !isFeishuBroadcastMention(m));
-  const hasOtherMention = userMentions.some((m) => m.id.open_id !== botOpenId);
+  const hasOtherMention = userMentions.some((m) => m.id.open_id !== normalizedBotOpenId);
 
   if (isDirectMessage) {
     // DM: trigger if any non-bot user is mentioned
     return hasOtherMention;
   }
   // Group: need to mention both bot and other users
-  const hasBotMention = userMentions.some((m) => m.id.open_id === botOpenId);
+  const hasBotMention = userMentions.some((m) => m.id.open_id === normalizedBotOpenId);
   return hasBotMention && hasOtherMention;
 }