I experienced the savegame load crash

every time i try to load a saved game the game crashes at 68%.

stderr says this:

Loading from file C:/Program Files (x86)/Steam/userdata/86297784/304730/local/save/Pety.sav
active mods:
_usa/1
config dict:
fileFilters:model/vehicle: all
terrain: default
nameList: usa
fileFilters:model/tree: default
fileFilters:building: default
fileFilters:street: default
environment: default
fileFilters:multipleUnit: all
fileFilters:model/industry: default
savegame version 17
achievements earnable: 0
d:\urban\steam_build_x64\release\src\game\ecs\linesystem.cpp:455: struct line_util::Loop __cdecl `anonymous-namespace’::MakeLoop(const class std::vector<class std::vector<struct line_util::SectionPath,class std::allocator<struct line_util::SectionPath> >,class std::allocator<class std::vector<struct line_util::SectionPath,class std::allocator<struct line_util::SectionPath> > > > &,const class std::vector<struct std::pair<int,int>,class std::allocator<struct std::pair<int,int> > > &): Assertion `idx >= 0′ failed.
MinidumpCallback: dumpPath “C:/Program Files (x86)/Steam/userdata/86297784/304730/local/crash_dump/”, minidumpId “aa5299ef-cdd2-482b-9d57-7492d9efe732”, succeeded 1
local time is Sun Jan 03 13:04:51 2016

I haven’t changed any setting since yesterday.

The autosave which was generated a minute before Pety.sav also leads to crash.