diff --git a/yudao-module-ai/yudao-module-ai-biz/src/main/java/cn/iocoder/yudao/module/ai/service/chat/AiChatMessageServiceImpl.java b/yudao-module-ai/yudao-module-ai-biz/src/main/java/cn/iocoder/yudao/module/ai/service/chat/AiChatMessageServiceImpl.java
index f310ba69fd..e05b11196a 100644
--- a/yudao-module-ai/yudao-module-ai-biz/src/main/java/cn/iocoder/yudao/module/ai/service/chat/AiChatMessageServiceImpl.java
+++ b/yudao-module-ai/yudao-module-ai-biz/src/main/java/cn/iocoder/yudao/module/ai/service/chat/AiChatMessageServiceImpl.java
@@ -246,7 +246,7 @@ public class AiChatMessageServiceImpl implements AiChatMessageService {
         }
 
         // 2.1 查询 tool 工具
-        Set<String> toolNames = null;
+        Set<String> toolNames = Collections.emptySet();
         if (conversation.getRoleId() != null) {
             AiChatRoleDO chatRole = chatRoleService.getChatRole(conversation.getRoleId());
             if (chatRole != null && CollUtil.isNotEmpty(chatRole.getToolIds())) {