Hi there ! I've this bug too
I'm on a x64 windows, and I have the same last message in the output log.
Unfortunately my save game size is way beyond the attach files limit so I've upload the whole (save, log & dxdiag) as an archive on Google drive : https://drive.google.com/file/d/0B7cZBmWKJQt9WHpsM2tkLTRLRDg/view?usp=sharing
To reproduce: simply load the save, and try to enter the hold with the door right in front of the group, it should crash upon loading everytime.