TypeError: Cannot read properties of undefined (reading 'some')

[Nofated095]

I tried to deploy my VitePress on Vercel after i made commits on config.js, but there was errors on Vercel. The deploy failed

[19:02:12] Cloning github.com/Nofated095/bjempire (Branch: master, Commit: 23c769c)
[19:02:13] Cloning completed: 1.044s
[19:02:13] Build cache restored
[19:02:13] Running "vercel build"
[19:02:14] Vercel CLI 28.5.5
[19:02:15] Installing dependencies...
[19:02:15] yarn install v1.22.17
[19:02:15] info No lockfile found.
[19:02:15] [1/4] Resolving packages...
[19:02:17] [2/4] Fetching packages...
[19:02:21] [3/4] Linking dependencies...
[19:02:21] warning "vitepress > @docsearch/js > @docsearch/react > @algolia/[email protected]" has unmet peer dependency "@algolia/client-search@>= 4.9.1 < 6".
[19:02:22] [4/4] Building fresh packages...
[19:02:22] success Saved lockfile.
[19:02:22] Done in 6.72s.
[19:02:22] yarn run v1.22.17
[19:02:22] $ vitepress build docs
[19:02:22] �[36mvitepress v1.0.0-alpha.29�[39m
[19:02:22] - building client + server bundles...
[19:02:29] �[32m✓�[0m building client + server bundles...
[19:02:29] - rendering pages...
[19:02:29] TypeError: Cannot read properties of undefined (reading 'some')
[19:02:29]     at file:///vercel/path0/docs/.vitepress/.temp/app.js:2208:23
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at callWithAsyncErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:24:21)
[19:02:29]     at getter (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1151:24)
[19:02:29]     at doWatch (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1175:13)
[19:02:29]     at watchEffect (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1094:12)
[19:02:29]     at setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2207:5)
[19:02:29]     at _sfc_main$w.setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2239:25)
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at setupStatefulComponent (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:5762:29)
[19:02:29] TypeError: Cannot read properties of undefined (reading 'some')
[19:02:29]     at file:///vercel/path0/docs/.vitepress/.temp/app.js:2208:23
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at callWithAsyncErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:24:21)
[19:02:29]     at getter (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1151:24)
[19:02:29]     at doWatch (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1175:13)
[19:02:29]     at watchEffect (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1094:12)
[19:02:29]     at setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2207:5)
[19:02:29]     at _sfc_main$w.setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2239:25)
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at setupStatefulComponent (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:5762:29)
[19:02:29] TypeError: Cannot read properties of undefined (reading 'some')
[19:02:29]     at file:///vercel/path0/docs/.vitepress/.temp/app.js:2208:23
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at callWithAsyncErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:24:21)
[19:02:29]     at getter (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1151:24)
[19:02:29]     at doWatch (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1175:13)
[19:02:29]     at watchEffect (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:1094:12)
[19:02:29]     at setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2207:5)
[19:02:29]     at _sfc_main$w.setup (file:///vercel/path0/docs/.vitepress/.temp/app.js:2239:25)
[19:02:29]     at callWithErrorHandling (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:15:22)
[19:02:29]     at setupStatefulComponent (/vercel/path0/node_modules/@vue/runtime-core/dist/runtime-core.cjs.prod.js:5762:29)
[19:02:29] �[31m✖�[0m rendering pages...
[19:02:29] �[31mbuild error:
[19:02:29] �[39m TypeError: items is not iterable
[19:02:29]     at recursivelyExtractLinks (file:///vercel/path0/docs/.vitepress/.temp/app.js:443:24)
[19:02:29]     at getFlatSideBarLinks (file:///vercel/path0/docs/.vitepress/.temp/app.js:453:5)
[19:02:29]     at ReactiveEffect.fn (file:///vercel/path0/docs/.vitepress/.temp/app.js:2941:24)
[19:02:29]     at ReactiveEffect.run (/vercel/path0/node_modules/@vue/reactivity/dist/reactivity.cjs.prod.js:159:25)
[19:02:29]     at ComputedRefImpl.get value [as value] (/vercel/path0/node_modules/@vue/reactivity/dist/reactivity.cjs.prod.js:1072:39)
[19:02:29]     at ReactiveEffect.fn (file:///vercel/path0/docs/.vitepress/.temp/app.js:3006:67)
[19:02:29]     at ReactiveEffect.run (/vercel/path0/node_modules/@vue/reactivity/dist/reactivity.cjs.prod.js:159:25)
[19:02:29]     at ComputedRefImpl.get value [as value] (/vercel/path0/node_modules/@vue/reactivity/dist/reactivity.cjs.prod.js:1072:39)
[19:02:29]     at unref (/vercel/path0/node_modules/@vue/reactivity/dist/reactivity.cjs.prod.js:981:29)
[19:02:29]     at file:///vercel/path0/docs/.vitepress/.temp/app.js:3010:11
[19:02:29] error Command failed with exit code 1.
[19:02:29] info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
[19:02:29] Error: Command "yarn build" exited with 1

export default {
    base: '/',
    title: '北平帝国',
    appearance: true,
    lastUpdated: false,
    themeConfig: {
        nav: [
            { text: '行政区划', link: '/gov' },
            { text: '政策措施', link: '/configs' },
            { text: '要闻', link: '/news' }
        ],
        sidebar: [
            { text: '行政区划', link: '/gov' },
            { text: '政策措施', link: '/configs' },
            { text: '要闻', link: '/news' }
        ],
        socialLinks: [
            { icon: 'github', link: 'https://github.com/Nofated095/' }
        ],
        footer: {
            message: 'Released under the MIT License.',
            copyright: 'Copyright © 2022-present BJE'
        }
    }
}

I am not sure if the problem was caused by the config.js, but the error appeared after I committed.