TypeError: Cannot read properties of undefined (reading 'name')

[huan]

Description

When a child machine has been in a state with the exit: sendParent action set, if the parent machine stop, then the error will be thrown.

I guess this is because the parent has been destroyed before the child.

Expected Result

The interpreter should be stopped gracefully. (executed all the exit from all children before destroy parent?)

Actual Result

TypeError: Cannot read properties of undefined (reading 'name')

Reproduction

https://codesandbox.io/s/loving-sutherland-y3he8?file=/src/index.ts

Additional context

• Error invoke machine #2057

[Andarist]

I can confirm that this is a bug - and most likely a duplicate of another issue. I will try to look into this after the weekend as I already exactly know what happens, just need to figure out the most appropriate solution and write tests for this and related scenarios.

[Andarist]

Just an update - I'm implementing a fix for this, should open a PR in a couple of days. The issue/fix is somewhat delicate so I'm making sure to cover as many edge cases as I can.

[ptaranto]

Hey @Andarist any update on this?

I'm having the issue when sending an event from child to grandchild machine, here is a CDS for it: https://codesandbox.io/s/xstate-stop-parent-child-grandchild-tuv3nk?file=/src/App.tsx

when stoping the parent machine by clicking the button there's another error related to not being able to read listeners
to reproduce the original error related to this issue, it'll occur whenever you change the code in App and CDS hot reload happens