TypeError: Cannot read properties of null (reading 'push')

[stable kiln]

I'm a bit clueless about what is causing this, except the project produces this error in the client bundle when built, but not in development.

https://e264c050.ticket-counter.pages.dev/

(Not a cause of the solid-start-cloudflare-pages adapter, as this also occurs with the default node adapter)

source code: https://github.com/Razboy20/ticket_counter

[stable kiln]

downgrading solidjs to ^1.7 seemingly fixed the problem ._.