My custom function is producing an error if my mob dies before system.runTimeout ends

[flat tundra]

I have a custom function that tags a mob and after 3 seconds the tag gets removed; however, if the mob dies before those 3 seconds are up an error will pop up.

Here's the code:

  target.addTag(tag);
  system.runTimeout(() => {

    if (target) {

      target?.removeTag(tag);
    }
  }, ticks)
})```

[opal karma]

Why are you using a variable

And a function expression?

It's not like it's a useless thing

But whatever I wanna know what's the error