[fixed] Import OBJ from Blender,exported as selection,without having "join objects"

[Extrudeface]

Wings soft crash (does not import the model and a message appears, is not a fatal crash) when importing OBJ from Blender, having exported from there as "selection only"

True that is an improper way of exporting a mesh, probably, but a lot of people wont realize what's happening. Not 100% sure (could be some export setting from Blender OBJ's exporter, but strongly doubt it) but seems you can overcome the issue if instead of just selecting the meshes you want (to export the OBJ from Blender marking "selection only"), and hitting export (had played with the several objects/groups export settings) one hits in Blender ctrl + j to join the meshes (is not a physical melt of vertexes), then the "internal error" notification from Wings wont happen, neither the crash dump. It does not crash Wings in a fatal way, lets you work with it but recommends restarting it. Crash dump below, short version only, as I understood the long should be only provided under request. Meshes where closed, just cubes. Sorry, can't provide the model. It did seem to happen with Wings 2.17, but not with Wings 2.15.
Windows 7 Home Premium, 64 bits. GTX 1050 2gb. i7 860. 8gb RAM. HD 7200rpm.

Dump written 2018-11-17_10-39
Version: 2.1.7
OS: Windows 7 (build 7601, Service Pack 1), 64-bit edition
GPU: NVIDIA Corporation | GeForce GTX 1050/PCIe/SSE2
Window: geom
Reason: function_clause

Short stack trace:
[{wings,command_1,2,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,746}]},
{wings_develop,time_command,2,
[{file,"c:/Users/familjen/src/wings/src/wings_develop.erl"},
{line,79}]},
{wings,raw_command,4,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,629}]},
{wings_wm,handle_event,3,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,973}]},
{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,dispatch_event,1,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,747}]},
{wings_wm,get_and_dispatch,0,
[{file,"c:/Users/familjen/src/wings/src/wings_wm.erl"},{line,651}]},
{wings,init_part2,2,
[{file,"c:/Users/familjen/src/wings/src/wings.erl"},{line,104}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,247}]}]