Hi there, this is a bit of a weird crash since it is involving three mods but I wanted to make you aware of it. For some reason when autofilter is enabled and you go to upgrade a belt with deadlock's stacked items on it then the game will crash.

https://gist.github.com/jarquafelmu/896412920dbed2a96f6be85a36f0aecb

With the Autofilter, and the mod Upgrade planner and deadlock's stacked items on a belt, trying to upgrade the belt causes this crash to happen

The deadlock stacked item has nothing to do with it. Recreated the error without the mod loaded.

Also, this happens with upgrading power poles as well. Something might be fishy with the on_built_entity event Upgrade Planner raises... This should not be grabbed by Autofilter, since I am filtering the event for inserters.

Fixed in 0.18.4, thanks a lot for reporting.