[BUG] Runtime in code/modules/mapping/reader.dm, line 493: list index out of bounds

[MrCat15352]

proc name: build coordinate (/datum/parsed_map/proc/build_coordinate)
usr: Callistos/(new player)
usr.loc: (start area (23, 172, 1))
src: /datum/parsed_map (/datum/parsed_map)
call stack:
/datum/parsed_map (/datum/parsed_map): build coordinate(/list (/list), hyperspace (73,19,2) (/turf/open/space/transit/south), 0, 1)
/datum/parsed_map (/datum/parsed_map): load impl(61, 1, 2, 1, 0, -1e+31, 1e+31, -1e+31, 1e+31, 1)
/datum/parsed_map (/datum/parsed_map): load(61, 1, 2, 1, 0, null, null, null, null, 1, 0)
Shepherd-class Space Monastery (/datum/map_template/shuttle): load(hyperspace (61,1,2) (/turf/open/space/transit/south), 0, 1)
Shepherd-class Space Monastery (/datum/map_template/shuttle): load(hyperspace (61,1,2) (/turf/open/space/transit/south), 0, 0)
Shuttle (/datum/controller/subsystem/shuttle): load template(Shepherd-class Space Monastery (/datum/map_template/shuttle), overmap vessel (/datum/overmap/ship/controlled), 1)
overmap vessel (/datum/overmap/ship/controlled): Initialize(Hastings Relay (/datum/overmap/outpost/nanotrasen_ice), Shepherd-class Space Monastery (/datum/map_template/shuttle), 1)
overmap vessel (/datum/overmap/ship/controlled): New(Hastings Relay (/datum/overmap/outpost/nanotrasen_ice), Shepherd-class Space Monastery (/datum/map_template/shuttle))
Overmap (/datum/controller/subsystem/overmap): spawn ship at start(Shepherd-class Space Monastery (/datum/map_template/shuttle))
/datum/ship_select (/datum/ship_select): ui act("buy", /list (/list), /datum/tgui (/datum/tgui), /datum/ui_state/always_state (/datum/ui_state/always_state))
/datum/tgui (/datum/tgui): on act message("buy", /list (/list), /datum/ui_state/always_state (/datum/ui_state/always_state))
/datum/callback/verb_callback (/datum/callback/verb_callback): InvokeAsync()