Bug Report: Save Error In Grand Necropolis

Halfway through the quest in the Grand Necropolis where Emmrich is introduced, I began to get a pop-up saying the game encountered an error while trying to save. I could not save manually, and I noticed the game was not auto-saving, either. I completed the quest, hoping that the error would resolve itself or that the error would be resolved by leaving the error after completing the question. However, the error did not resolve and I lost approximately an hour of progress. 

When I quit the game and restarted it and hit continue, I was taken to my last manual save. When I attempted to manually save again, I was able to do so. I will complete the quest again and see if I run into the issue again, and if so, I will update with more info.

Platform: PC