How to fix my broken save

There was a zombie stuck between the ground and some wooden fences and he was glitched and untargeteable unless with Alt+Attack so I finally killed it but I couldn't grab the body, the character was unable to find the path and started backing up slowly infinitely trying to sort what to do.

I think it was the moment I disassembled a couple of fence to discover the body that game started to throw hundreds of errors per second and it crashed.

I cannot enter the save anymore as when it's about to do so it gets stuck showing me tips from the loading screen.

Now