Error rendering error pages: TypeError: mountedInstances.slice is not a function

Bug report

Describe the bug

On try to open a page that not exist (like: /asd), I get a server error when next try to render the _error page. I not have custom _page or _document and I using the next versions 9.1.5. the error not happen in version 9.0.5. I’m using micro custom server configured in a similar way that is in example but running it with typescript.

TypeError: mountedInstances.slice is not a function
    at emitChange (/Users/project/.next/server/static/development/pages/_error.js:2371:73)
    at new class_1 (/Users/project/.next/server/static/development/pages/_error.js:2392:9)
    at processChild (/Users/project/node_modules/react-dom/cjs/react-dom-server.node.development.js:3159:14)
    at resolve (/Users/project/node_modules/react-dom/cjs/react-dom-server.node.development.js:3124:5)
    at ReactDOMServerRenderer.render (/Users/project/node_modules/react-dom/cjs/react-dom-server.node.development.js:3598:22)
    at ReactDOMServerRenderer.read (/Users/project/node_modules/react-dom/cjs/react-dom-server.node.development.js:3536:29)
    at renderToString (/Users/project/node_modules/react-dom/cjs/react-dom-server.node.development.js:4245:27)
    at render (/Users/project/node_modules/next/dist/next-server/server/render.js:82:16)
    at Object.renderPage (/Users/project/node_modules/next/dist/next-server/server/render.js:323:20)
    at /Users/project/.next/server/static/development/pages/_document.js:4356:21
    at step (/Users/project/.next/server/static/development/pages/_document.js:45:23)
    at Object.next (/Users/project/.next/server/static/development/pages/_document.js:26:53)
    at asyncGeneratorStep (/Users/project/.next/server/static/development/pages/_document.js:239:24)
    at _next (/Users/project/.next/server/static/development/pages/_document.js:261:9)
    at /Users/project/.next/server/static/development/pages/_document.js:268:7
    at new Promise (<anonymous>)

To Reproduce

install the lattes next version and try to navigate to a page that not exist like /asd server will show Internal Server Error and console log will show the log previously explained.

Expected behavior

To show the normal 404 error page.

System information

• OS: macOS
• Version of Next.js: 9.1.5

[nathanredblur]

I finally solve this by mi self changing tsconfig.server.json file adding this fields: "lib": ["es2017"], "target": "es2017", I could understand the relation between my server files compilation and next 404 pages compilation.

[balazsorban44]

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