[Bug]: Server Crashing

[kelvinkipruto]

Describe the Bug

Server crashes when you directly go to a page with checkout as a mixin

Current behavior

The server crashes when you visit any page with checkout imported as a mixin

Expected behavior

The server should not crash

Steps to reproduce

On a fresh installation of release/v1.12.3 and latest capybara

1. Make a fresh installation with release/v1.12.3 and the latest capybara
2. Add a new page say in pages directory, say Test, and import checkout as a mixin
3. Add the page to the routes, with path say /test
4. After starting server, visit http://localhost:3000/test

What version of Vue Storefront are you using?

release/v1.12.3

What version of Node.js are you using?

v14.16.0

What browser (and version) are you using?

Chrome

What operating system (and version) are you using?

Windows

Relevant log output

whole request [/test]: 1650ms
Error [ERR_STREAM_WRITE_AFTER_END]: write after end
    at writeAfterEnd (_http_outgoing.js:668:15)
    at ServerResponse.end (_http_outgoing.js:789:7)
    at D:\play\commerce\latest\frontpage\core\scripts\server.ts:244:13
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
error Command failed with exit code 1.

Able to fix / change the documentation?

• [ ] Yes
• [X] No

Code of Conduct

• [X] I agree to follow this project's Code of Conduct