diff --git a/packages/plugins/@nocobase/plugin-api-doc/src/client/Document.tsx b/packages/plugins/@nocobase/plugin-api-doc/src/client/Document.tsx
index c7ee6806f..b515fcdfb 100644
--- a/packages/plugins/@nocobase/plugin-api-doc/src/client/Document.tsx
+++ b/packages/plugins/@nocobase/plugin-api-doc/src/client/Document.tsx
@@ -12,13 +12,13 @@ const Documentation = () => {
   const apiClient = useAPIClient();
   const { t } = useTranslation();
   const swaggerUIRef = useRef();
-
   const { data: urls } = useRequest<{ data: { name: string; url: string }[] }>({ url: 'swagger:getUrls' });
   const requestInterceptor = (req) => {
     if (!req.headers['Authorization']) {
       const match = location.pathname.match(/^\/apps\/([^/]*)\//);
-      // multi apps need to set X-App header
-      req.headers['X-App'] = match?.[1] || 'main';
+      if (match?.[1]) {
+        req.headers['X-App'] = match?.[1];
+      }
       req.headers['Authorization'] = `Bearer ${apiClient.auth.getToken()}`;
     }
     return req;