Sculpt {badmatch,undefined}

[Hank]

Hello,

I was working with Sculpt and got:

Dump written 2018-10-16_12-59
Version: 2.1.7
OS: Windows 8 (build 9200), 64-bit edition
GPU: Intel | Intel® HD Graphics 520
Window: geom
Reason: {badmatch,undefined}

Stack trace:
[{wings_draw,'-update_face_sel/2-fun-0-',3,
[{file,"c:/Users/familjen/src/wings/src/wings_draw.erl"},
{line,499}]},
{lists,foldl,3,[{file,"lists.erl"},{line,1263}]},
{wings_draw,update_face_sel,2,
[{file,"c:/Users/familjen/src/wings/src/wings_draw.erl"},
{line,502}]},
{wings_dl,map_1,5,
[{file,"c:/Users/familjen/src/wings/src/wings_dl.erl"},{line,276}]},
{wings_draw,refresh_dlists,1,
[{file,"c:/Users/familjen/src/wings/src/wings_draw.erl"},
{line,50}]},
{wings_pick,handle_hilite_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_pick.erl"},
{line,197}]},
{wings_pick,event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_pick.erl"},
{line,55}]},
{wings,handle_event_1,2,
[{file,"f:/unixlike/src/wings/src/wings.erl"},{line,380}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,972}]},
{wings_wm,send_event,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,939}]},
{wings_wm,do_dispatch,2,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,840}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,651}]},
{wings,init_part2,2,
[{file,"f:/unixlike/src/wings/src/wings.erl"},{line,104}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]

BR, Hank