Playdate Simulator crashes when playing Pulp game

Hello! I was making my first Playdate game in Pulp, called Dots Mania. In this game you need to collect as many dots as possible before time runs out. It's still a work in progress.
screenshot
But I have an issue: when I play this game in the Playdate Simulator, when the time runs out, the Playdate Simulator crashes with this error:

Update error: ?:-1: attempt to index a nil value (upvalue '?')
stack traceback:
	?: in upvalue '?'
	?: in function <?:1632>
	(...tail calls...)
	?: in function <?:1365>
	(...tail calls...)
	?: in upvalue '?'
	?: in upvalue '?'
	?: in function <?:1478>
	(...tail calls...)
	?: in function <?:1365>
	(...tail calls...)
	?: in upvalue '?'
	?: in field 'callback'
	?: in upvalue '?'
	?: in function <?:3753>

I don't know if it's a bug or I'm doing something wrong..
Also, here's the PDX with the JSON:
EPKBYSZMFJDots-Mania_20231008155432.zip (61.7 KB)