[DCS/2.9.15.9599] ME hangs indefinitely on save/change on a route calculation with 16 wpts (GermanyCW Baumholder)

[Apple]

2025-04-27 11:07:41.325 WARNING LOG (27504): 1 duplicate message(s) skipped.
2025-04-27 11:07:41.325 ALERT   LUACOMMON (Main): Error: GUI Error: [string "./MissionEditor/modules/me_mission.lua"]:7131: attempt to index field '?' (a nil value)
GUI debug.traceback: stack traceback:
    [C]: ?
    [string "./MissionEditor/modules/me_mission.lua"]:7131: in function 'calc_route_length'
    [string "./MissionEditor/modules/me_mission.lua"]:7123: in function 'build_route_line'
    [string "./MissionEditor/modules/me_mission.lua"]:7893: in function 'update_group_map_objects'
    [string "./MissionEditor/modules/me_vehicle.lua"]:2093: in function 'updateHeading'
    [string "./MissionEditor/modules/me_route.lua"]:650: in function 'UpdateGroupOnRoad'
    [string "./MissionEditor/modules/me_vehicle.lua"]:759: in function 'onChange'
    [string "./dxgui/bind/Button.lua"]:22: in function 'callback'
    [string "./dxgui/bind/Widget.lua"]:375: in function <[string "./dxgui/bind/Widget.lua"]:370>

This creates a loop the ME cannot exit