Campaign glitch stopping progress

I am up to the end of Act 3 Chapter 3 (very last checkpoint) but cannot progress as Del has glitched and won’t spawn. Since he can’t help Kait open the door to leave the desert , the game crashes instead of finishing the Chapter. Please help, since I have done all the side quests and do not want to have to do it all over again.

It happened to me. After a few restarts I gave up and called it a day, next time I tried it worked at once.