diff --git a/docs/en/guide/extending-default-theme.md b/docs/en/guide/extending-default-theme.md
index e7d67305..21af5dd7 100644
--- a/docs/en/guide/extending-default-theme.md
+++ b/docs/en/guide/extending-default-theme.md
@@ -319,7 +319,7 @@ export default defineConfig({
         {
           find: /^.*\/VPNavBar\.vue$/,
           replacement: fileURLToPath(
-            new URL('./components/CustomNavBar.vue', import.meta.url)
+            new URL('./theme/components/CustomNavBar.vue', import.meta.url)
           )
         }
       ]
diff --git a/src/client/theme-default/support/sidebar.ts b/src/client/theme-default/support/sidebar.ts
index 201f2536..13cd0aad 100644
--- a/src/client/theme-default/support/sidebar.ts
+++ b/src/client/theme-default/support/sidebar.ts
@@ -112,7 +112,8 @@ function addBase(items: SidebarItem[], _base?: string): SidebarItem[] {
   return [...items].map((_item) => {
     const item = { ..._item }
     const base = item.base || _base
-    if (base && item.link) item.link = base + item.link
+    if (base && item.link)
+      item.link = base + item.link.replace(/^\//, base.endsWith('/') ? '' : '/')
     if (item.items) item.items = addBase(item.items, base)
     return item
   })
diff --git a/src/node/build/build.ts b/src/node/build/build.ts
index e6d6a926..364c7490 100644
--- a/src/node/build/build.ts
+++ b/src/node/build/build.ts
@@ -109,6 +109,7 @@ export async function build(
         clientResult.output.some(
           (chunk) =>
             chunk.type === 'chunk' &&
+            // @ts-ignore only exists for rolldown-vite
             (vite.rolldownVersion || chunk.name === 'theme') && // FIXME: remove when rolldown-vite supports manualChunks
             chunk.moduleIds.some((id) => id.includes('client/theme-default'))
         )