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Setting server in remix.config.js fails when using express adapter

See original GitHub issue

What version of Remix are you using?

1.4.3

Steps to Reproduce

Create app using create-remix (express, just the basics, typescript)
Set server in remix.config.js to let remix produce one consolidated build.
npm run build works
npm run dev fails

Sample code here: https://github.com/edwin177/remix-express/tree/express-server-build

Expected Behavior

Server should load

Actual Behavior

App crashes with the following error:

/home/xxx/remix-express/node_modules/@remix-run/server-runtime/routes.js:18
  return Object.entries(manifest).filter(([, route]) => route.parentId === parentId).map(([id, route]) => ({ ...route,
                ^
TypeError: Cannot convert undefined or null to object
    at Function.entries (<anonymous>)
    at Object.createRoutes (/home/xxx/remix-express/node_modules/@remix-run/server-runtime/routes.js:18:17)
    at Object.createRequestHandler (/home/xxx/remix-express/node_modules/@remix-run/server-runtime/server.js:26:25)
    at createRequestHandler (/home/xxx/remix-express/node_modules/@remix-run/express/server.js:35:28)
    at Object.<anonymous> (/home/xxx/remix-express/build/index.js:42:5)
    at Module._compile (internal/modules/cjs/loader.js:1085:14)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)