Agh that was exactly my issue. Your recommendation worked perfectly!

Thank you very much

It seems there may be a small bug in the condition within set_request_slot. I am trying to set spidertron logistic requests to 0 from a mod function, but when I try to run a line like spidertron_entity.set_request_slot({name=item.name, count=0}, slot)
I get the following error

Error while running ...