The mod ERM Unit Control (1.0.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event erm_unit_control::on_player_selected_area (ID 55)
erm_unit_control/script/unit_control.lua:1044: table index is nil
stack traceback:
erm_unit_control/script/unit_control.lua:1044: in function 'process_unit_selection'
erm_unit_control/script/unit_control.lua:1118: in function <erm_unit_control/script/unit_control.lua:1097>
(...tail calls...)
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Mod i use as well.
https://mods.factorio.com/mod/ZombieHorde