UE4 Suddenly Crashing Upon Saving Level [with Video]

So I’m having an issue with UE4, for no apparent reason, crashing when trying to save a level. I’ve been building a level for my level design course and for the first time in the 30hours I put into it, I can no longer save, specifically, the program will crash when the level save hits 75%. I have no idea why this is happening, I’ve done a map check and have zero errors in Load Error and Map Check

The only upside is that progress is actually saved upon crashing, this just means I have to intentionally crash the program in order to save ANY progress I make on the level.

Youtube Link for video example of crash
Crash Log

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks