It seems Misson D3 (Placebo Syndrome) in the campaign is bugged, the game reliably crashes after a few moments in the mission. Seeing that every other mission ran fine, I think it's likely a bug, and not related to my hardware.

There is a thread about this issue on the Steam forums: http://steamcommunity.com/app/274500/discussions/1/1290691937717387144/
Apparently the bug has been fixed yesterday. So it's best to check if the update is already on GOG. If it isn't, it should be soon.

Same issue, hope the fix comes soon...

Experiencing the same bug, i don't know if the bug manifests the same way for everyone so this is my experience with it:
The crash occurs when you are detected by a turret,, and there six of them i think around the map. You can still kill the turrets and you can go into their sight radius if you're concealed(i did it with camo, i don't know if smoke or emp works)

it actually is possible to beat the mission if you use indirect fire weapons to hit them from behind cover. Needlessly frustrating especially since it'll probably be patched soon, but it's a challenge you can tackle for as long as the bug lasts.

I was experiencing this issue and was just coming to report it myself, but the newest update on GoG fixed it, I just let it update via GoG Galaxy.

In case any devs read this forum and care, here's a screenshot of an area in the Nobre Dunes Gated Community that triggers the crash reliably. Just walking a few more steps northeast of this point crashes the game every time.

Ah yes that is the mission I am having the trouble in as well.