I got a bug in react where a sub component was trying to call a state setter passed in from props of the parent component. The issue took my about an hour to debug bug, but if I spent some time re-reading my code, I could have fixed it in 5 minutes. Programming sucks.

Warning: Cannot update a component (App) while rendering a different component (Lobby). To locate the bad setState() call inside Lobby, follow the stack trace as described in https://fb.me/setstate-in-render
in Lobby (at App.js:37)
in div (at App.js:35)
in App (at src/index.js:9)
in StrictMode (at src/index.js:8)

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I spent an hour debugging this react error
23.60 GEEK