Hi Freddy
I'm not with Laminar Research, just a fellow simmer in the UK, but when I looked through your Log.txt file I found the following entry just before your copy of X-Plane 11 crashed:-
removing somebody from active listremoving somebody from active list1:12:02.787 E/SYS: +-------------------------------------------------------------------------------
1:12:02.787 E/SYS: | rel_assert Error! Possibly an out of range vector! Attach the debugger and see who called this!
1:12:02.787 E/SYS: | active_vertex
1:12:02.787 E/SYS: | open_batch
1:12:02.787 E/SYS: | Please report this to Laminar Research.
1:12:02.787 E/SYS: | (OGL_vertex_stream.cpp:406)
1:12:02.787 E/SYS: +-------------------------------------------------------------------------------
--=={This application has crashed!}==--
As you will see from the yellow heighted section, it would be best to send a bug report as suggested to http://dev.x-plane.com/support/bugreport.html
Personally I would also check your PC/Laptop/Mobile hardware specification against that recommended by LR. More details on this can be found @ https://www.x-plane.com/kb/x-plane-11-system-requirements/
Hope this helps :-)
Regards