Fix: Ensure route.children existence before accessing in initRouter()

In the initRouter() function, added a check to ensure the existence of route.children before accessing it. This prevents the "TypeError: Cannot read properties of undefined" error that occurred when trying to access route.children[0] without confirming its existence. The check ensures that route.children is present and not an empty array before proceeding to access its elements.

src/router/index.ts

@@ -158,7 +158,12 @@ router.beforeEach((to: ToRouteType, _from, next) => {
             getTopMenu(true);
             // query、params模式路由传参数的标签页不在此处处理
             if (route && route.meta?.title) {
-              if (isAllEmpty(route.parentId) && route.meta?.backstage) {
+              if (
+                isAllEmpty(route.parentId) &&
+                route.meta?.backstage &&
+                route.children &&
+                route.children.length > 0
+              ) {
                 // 此处为动态顶级路由（目录）
                 const { path, name, meta } = route.children[0];
                 useMultiTagsStoreHook().handleTags("push", {