In response to post #24468144. #24473809, #24475994, #24816604 are all replies on the same post.
No clue... -_- I made the entrance of that dungeon as same as others.
There is another up-coming dungeon, so how about it as a compensation ^u^/:
The following isolation process is tedious and Ilinalta Reactor is not worth spending for this, but if you want, I suggest:
1. Boot the Tes5edit and scan all your mods (vanilla files are automatically scanned)
2. Check the Block which my mod uses
3. If there are some data conflict, that may be the trouble
Still, in my case, even if there are 'Location conflict' among mods, the CTD does not happen. As an example, I have 'JK's Skyrim pack' and my own 'Player Housing pack all around Skyrim', and in Rorikstead my house is buried in JK's building, but no CTD and my house and JK's co-exist friendly. ^u^/