Hi. I get this error when trying to move non modded items, then the game exits the save and I'm back to main menu:

The mod Factory organizer (1.0.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event factory_organizer::factory_organizer-enter (ID 215)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__factory_organizer/scripts/main.lua:896: in function 'teleport'
factory_organizer/scripts/main.lua:1139: in function 'on_teleport'
factory_organizer/scripts/main.lua:1335: in function <factory_organizer/scripts/main.lua:1324>

Thanks for report. Should be fixed in 1.0.1

Thank you.