diff --git a/src/store/chat/helpers.test.ts b/src/store/chat/helpers.test.ts
index 97fd58bdc0a1..40070a0f63d7 100644
--- a/src/store/chat/helpers.test.ts
+++ b/src/store/chat/helpers.test.ts
@@ -74,7 +74,7 @@ describe('chatHelpers', () => {
     ] as ChatMessage[];
 
     it('returns all messages if history is disabled', () => {
-      const config = { enableHistoryCount: false, historyCount: 0 } as LobeAgentChatConfig;
+      const config = { enableHistoryCount: false, historyCount: undefined } as LobeAgentChatConfig;
       const slicedMessages = chatHelpers.getSlicedMessagesWithConfig(messages, config);
       expect(slicedMessages).toEqual(messages);
     });
@@ -105,5 +105,11 @@ describe('chatHelpers', () => {
       const slicedMessages = chatHelpers.getSlicedMessagesWithConfig([], config);
       expect(slicedMessages).toEqual([]);
     });
+
+    it('returns an empty array when historyCount is zero', () => {
+      const config = { enableHistoryCount: true, historyCount: 0 } as LobeAgentChatConfig;
+      const slicedMessages = chatHelpers.getSlicedMessagesWithConfig(messages, config);
+      expect(slicedMessages).toEqual([]);
+    });
   });
 });
diff --git a/src/store/chat/helpers.ts b/src/store/chat/helpers.ts
index cd0a5e5af644..3648d776c0f6 100644
--- a/src/store/chat/helpers.ts
+++ b/src/store/chat/helpers.ts
@@ -14,13 +14,13 @@ const getSlicedMessagesWithConfig = (
   config: LobeAgentChatConfig,
   includeNewUserMessage?: boolean,
 ): ChatMessage[] => {
-  // if historyCount is not enabled or set to 0, return all messages
-  if (!config.enableHistoryCount || !config.historyCount) return messages;
+  // if historyCount is not enabled, return all messages
+  if (!config.enableHistoryCount || config.historyCount === undefined) return messages;
 
   // if user send message, history will include this message so the total length should +1
   const messagesCount = !!includeNewUserMessage ? config.historyCount + 1 : config.historyCount;
 
-  // if historyCount is negative, return empty array
+  // if historyCount is negative or set to 0, return empty array
   if (messagesCount <= 0) return [];
 
   // if historyCount is positive, return last N messages