Error at .remove(). Cannot read properties of 'null' (reading 'remove')

Apologies for my formatting, floatcashes is an empty array, that is filled with the ids of the elements, floatcash.
As far as I am aware it is working, but when it gets to .remove() it does not like it.
I don't understand why it can find the element, but not use it.
I'm guessing it gets switched to a value that it doesn't like? but other bits of my code seem to not mind element.remove()