Celia instadeath bug

[Legion666]

I'm playing as a Cornac Solipsist on Exploration mode. Doing the And Now For A Grave quest cleared out everything up to the main chamber, start fighting Celia, do some damage then use Slumber then Dreamscape, it teleports you to the dreamscape and straight back out again saying quest complete. I have a screenshot of the message reel but the file size is too big and I can't figure out how to compress it. The message reel shows me going to Dreamscape, do nothing, "Celia's mind shatters into 2109 pieces" then I'm back to normal.