nostr:nprofile1qqs827g8dkd07zjvlhh60csytujgd3l9mz7x807xk3fewge7rwlukxgpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszrnhwden5te0dehhxtnvdakz7qgswaehxw309ahx7um5wghx6mmd9usjfpck we have a bug somewhere that the (old?) return from amber wasn't parsed correctly and it created an encrypted ciphertext with a "-null" attached to it. You can see on this user's 1000 mute list below. 

I added a pre-check on the NIP-04 decrypt so that it fixes this issue if Amethyst see it out there. You might want to release a new version with the latest commit to make sure Amber can also decrypt and fix it when using other clients.  https://image.nostr.build/710ef75319e48ecebf5cf8312d70475fc197179f86b450f0f8b50d07ac93ae04.jpg