Ive just upgraded the app and Yes it does work with the U11, everything functions as it should.. both selfie and rear cam...
If it doesnt work for you... Goto > Settings > Apps > Camera > Storage.... Clear Cache and Data.. try Cam again...
If its still crashing... go back to Apps > Camera and "Uninstall Updates" and it will roll back to last version..
This update is for the U11 Eyes.. theyre getting new Stickers and fun emojis with new things to play with in the camera and on your pics .. U11 owners are annoyed because the U11, the HTC flagship didnt get anything new at all.. which is a shame..