Hello, when I accidentally pressed hotkeys for add craft to fornt and my inventory was closed, I got an error:
screen - https://flic.kr/p/2nC9ZhN

I think you should check if the selected_prototype field is in the event object

|if event.selected_prototype and event.selected_prototype.base_type == "recipe"| instead off | if event.selected_prototype.base_type == "recipe"|

P. S. sorry for my english :)))

Posting this here in case it's related. I changed my hotkey to F since alt is taken already by a couple of things and every time I try to use it I get this error and crash to start EDIT: It does it with other keys too, not just F

The mod Queue to Front (Alt+ Mouse Button) (0.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event queue-to-front-button::front-craft (ID 188)
queue-to-front-button/control.lua:2: attempt to index field 'selected_prototype' (a nil value)
stack traceback:
queue-to-front-button/control.lua:2: in function <queue-to-front-button/control.lua:1>

Crashing here too anytime somebody accidentally misses the button. No fixes yet? :(