Prerendering with node-custom-server fail

[mxp-qk]

I'm trying to migrate a remix app to react-router v7 with a custom server. It works fine until we tried adding some prerendered page to the react-router config.

To reproduce :

• start from the node template npx create-react-router@latest --template remix-run/react-router-templates/node-custom-server
• add a prerender option to react-router config prerender:["/"]
• run npm run build

Here the error

[react-router] Cannot convert undefined or null to object
    at Function.values (<anonymous>)
    at groupRoutesByParentId2 (.../node_modules/@react-router/dev/dist/vite.js:2717:10)
    at createPrerenderRoutes (.../node_modules/@react-router/dev/dist/vite.js:2728:76)
    at handlePrerender (.../node_modules/@react-router/dev/dist/vite.js:2544:16)
    at Object.handler (.../node_modules/@react-router/dev/dist/vite.js:2066:13)
    at async Promise.all (index 0)
    at PluginDriver.hookParallel (file://.../node_modules/rollup/dist/es/shared/node-entry.js:20868:9)
    at file://.../node_modules/rollup/dist/es/shared/node-entry.js:21911:13
    at catchUnfinishedHookActions (file://.../node_modules/rollup/dist/es/shared/node-entry.js:21286:16)
    at Module.build (file://.../node_modules/vite/dist/node/chunks/dep-Cjmyj91f.js:65599:16) {
  code: 'PLUGIN_ERROR',
  plugin: 'react-router',
  hook: 'writeBundle'
}