Attacking undercity mean we break game yes-yes

[out] <1082.5s>  show_message_event_located() called, showing event for faction [wh2_main_skv_clan_eshin] with title [event_feed_strings_text_wh2_dlc12_event_feed_string_scripted_event_under_empire_destroyed_title], primary detail [regions_onscreen_wh2_main_dragon_isles_shattered_stone_isle] and secondary detail [event_feed_strings_text_wh2_dlc12_event_feed_string_scripted_event_under_empire_destroyed_description] at co-ordinates [989, 197]
[out] <1082.5s>  show_message_event_located() called, showing event for faction [wh2_main_lzd_last_defenders] with title [event_feed_strings_text_wh2_dlc12_event_feed_string_scripted_event_under_empire_destroyed_title], primary detail [regions_onscreen_wh2_main_dragon_isles_shattered_stone_isle] and secondary detail [event_feed_strings_text_wh2_dlc12_event_feed_string_scripted_event_under_empire_destroyed_remover_description] at co-ordinates [989, 197]
[out] <1082.5s>  nanu_vermintide_under_city_destroyed function fired
[out] <1082.5s>  undercity destroyed by AI, initiating battle for control of the city
[out] <1082.5s>  nanu_vermintide_GenerateSkavenInvasion fired
[out] <1082.5s>  attempting to spawn a skaven army at region wh2_main_dragon_isles_shattered_stone_isle
[out] <1082.5s>  nanu_vermintide_generate_skaven_army function fired
[out] <1082.5s>  wh2_dlc12_under_empire_settlement_warren_3
[out] <1082.5s>  wh2_dlc12_under_empire_warpstone_mine_1
[out] <1082.5s>  wh2_dlc12_under_empire_food_kidnappers_2
[out] <1082.5s>  wh2_dlc12_under_empire_food_raiding_camp_1
[out] <1082.5s>  army_string: wh2_main_skv_inf_stormvermin_1,wh2_main_skv_inf_stormvermin_1,wh2_dlc14_skv_inf_warp_grinder_0,wh2_dlc14_skv_inf_warp_grinder_0,wh2_main_skv_inf_gutter_runner_slingers_0,wh2_main_skv_inf_plague_monks,wh2_main_skv_inf_gutter_runners_0,wh2_main_skv_inf_plague_monks,wh2_main_skv_inf_gutter_runners_0,wh2_main_skv_inf_plague_monks,wh2_main_skv_inf_gutter_runner_slingers_0,wh2_main_skv_inf_plague_monks,wh2_main_skv_inf_clanrat_spearmen_1,wh2_main_skv_inf_clanrats_1,wh2_main_skv_inf_clanrats_1,wh2_main_skv_inf_clanrats_1,wh2_main_skv_inf_clanrat_spearmen_1,wh2_main_skv_inf_clanrats_1,wh2_main_skv_inf_clanrats_1
[out] <1082.5s>  nanu_vermintide_generate_skaven_army function completed
[out] <1082.5s>  [string "script\campaign\mod\nanu_vermintide.lua"]:424: bad argument #2 to 'remove' (number expected, got string)
[out] <1082.5s>  stack traceback:
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:10: in function 'safeCall'
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:31: in function <[string "script\campaign\main_warhammer\mod\debugger.lua"]:25>
	(tail call): ?
	[C]: in function 'pcall'
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:7: in function 'safeCall'
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:31: in function <[string "script\campaign\main_warhammer\mod\debugger.lua"]:25>
	(tail call): ?
	[C]: in function 'pcall'
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:7: in function 'safeCall'
	[string "script\campaign\main_warhammer\mod\debugger.lua"]:31: in function 'callback'
	[string "script\_lib\lib_core.lua"]:1238: in function 'event_callback'
	[string "script\_lib\lib_core.lua"]:1148: in function 'callback'
	[string "script\_lib\lib_core.lua"]:1156: in function <[string "script\_lib\lib_core.lua"]:1156>