Crash when changing mount type of conventional gun

I get a very repeatable crash to desktop when I change a conventional gun's mount type (eg. from turreted to external). It happens only after I have been playing the game some time (I do not know what the breaking point is, but after cca 20 minutes of module editing it crashes almost always), when the game is freshly started the crash doesn't happen. If gun's mount type has been changed without crash, it can be changed later without crashing.

Operating System: Windows 7 64bit
CPU: AMD Ryzen
Graphics: GeForce GTX 1060 3GB
RAM: 16GB

Repeating steps:
* start the game, go to the module design
* edit any module. Change several parameters
* leave editing screen (with or without saving, shouldn't matter)
* go to Weapon - New Conventional Gun Module
* click at checkbox next to External Mount
The game crashes immediately.

Alternative steps:
* start the game, go to the module design
* go to Weapon - New Conventional Gun Module
* change several parameters
* click at checkbox next to External Mount
The game crashes immediately.

The crash does not happen when editing any other module type I know of (it doesn't happen even with railguns and coilguns).

I checked the crash logs and the backtrace is the same every time. This is a representative example:



Version: CDE 1.1.2.1 Windows

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4.6.0 NVIDIA 388.31
Max Texture Image Units: 32
Max Combined Texture Image Units: 192
Max Vertex Texture Image Units: 32
Max Draw Buffers: 8
Max Texture Size: 32768

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Steam Stats Received
Error: EXCEPTION_ACCESS_VIOLATION
0 0x00ff2bd5 util::SimpleSerializationManager::ClearTopLevelMutualExclusivesOfDatum Line Info Error 487
1 0x0100e4fa ?OnClick@UICheckbox@@AAEXXZ              Line Info Error 487
2 0x00fd5398 ?MouseUp@UISimpleButton@@UAE?AV?$Maybe@U?$Vec2@N@util@@@util@@ABUInputModifiers@@_N1@Z Line Info Error 487
3 0x00fe0d2e ?TriggerMouseUp@Interface@@QAEXABUInputModifiers@@U?$Vec2@N@util@@_N@Z Line Info Error 487
4 0x00fe023c ?HandleMouseInput@Interface@@QAE_NW4Type@MouseButton@@W42MouseInput@@ABUInputModifiers@@U?$Vec2@N@util@@@Z Line Info Error 487
5 0x00fd05c2 ?HandleMouseInput@GameManager@@QAEXW4Type@MouseButton@@W42MouseInput@@ABUInputModifiers@@U?$Vec2@N@util@@@Z Line Info Error 487
6 0x00fc0f57 ?MouseCallback@@YAXPAUGLFWwindow@@HHH@Z  Line Info Error 487
7 0x01040b3a __glfwInputMouseClick                    Line Info Error 487
8 0x01042e1e __glfwUnregisterWindowClassWin32         Line Info Error 487
9 0x763662fa gapfnScSendMessage                       Line Info Error 487
10 0x76366d3a GetThreadDesktop                         Line Info Error 487
11 0x76370d3f GetClientRect                            Line Info Error 487
12 0x76370d65 CallWindowProcW                          Line Info Error 487
13 0x60d960fb wglSwapBuffers                           Line Info Error 487
14 0x763662fa gapfnScSendMessage                       Line Info Error 487
15 0x76366d3a GetThreadDesktop                         Line Info Error 487
16 0x763677c4 CharPrevW                                Line Info Error 487
17 0x7636788a DispatchMessageW                         Line Info Error 487
18 0x734d3060 OverlayHookD3D3                          Line Info Error 487
19 0x01041587 __glfwPlatformPollEvents                 Line Info Error 487
20 0x01046d4b _onexit                                  f:\dd\vctools\crt\crtw32\dllstuff\atonexit.c(138)
21 0x772c336a BaseThreadInitThunk                      Line Info Error 487
22 0x77ac98f2 RtlInitializeExceptionChain              Line Info Error 487
23 0x77ac98c5 RtlInitializeExceptionChain              Line Info Error 487

I am currently using several modded materials, but this exact issue was happening even with a vanilla game. I checked integrity of game files with steam, and updated graphics drivers, it didn't help.