Hello, this error happened to me while playing on the map linked here : https://mods.factorio.com/mod/SpidertronPatrols/discussion/643b9d6d76dea792c8d2fec4
I am still discovering the mod and i noticed that using shift left click (by mistake) to give a new unit that never had any waypoint the task to "replace previous waypoint" generate an error : https://ibb.co/2N0z9SR
step to reproduce from other thread's save:
1)load
2)select the visible aircraft
3)remove all waypoint
4) exit GUI
5)select the visible aicraft again
6) left click on the the top right remote icon button from the aircraft GUI
7) with or without closing the GUI, shift left click somewhere on the grass.
step 2 3 4 are optionnal for the error to occur, they are included in the description because the error occur only when the schedule is empty, and the schedule from the other save was not.
I tried with a brand new spiderling and one of lex's aicraft too .
I am not sure if it comes from mod compatibility i have soft locked myself away from some vehicule by using mods not very compatible and maybe will discover other problems, maybe this error is one of them :/ I know how to avoid it now, i'm just used to shift left click to queue order with the AAI mod which is why i commited the mistake in the first place , i will continue experimenting with the mod :)
