So, I had recently changed my name from onemario12345 to Onemario4321, and I also changed my skin aswell, and after doing so I noticed Morph bugged out, and seperated my newly named and skinned self from my previously named and skinned self. I was able to morph between them, and I couldn't delete my previous self, as it still thinks that was my main unmorphed form. I was fine with this at first, but I tried to enter a Sync Chamber, and it acted like I didn't have any other shells, when I had 2 others. I also noticed one of my shells had my previous skin. When I removed the Shell Storage that had my previous skin in it, the game crashed. I can't delete this world because I built so much in it. I'm using Minecraft version 1.7.10, the most recent version of Morph, but not the most recent versions of iChunUtil, or Sync. I'm going to do so soon.

EDIT: As of writing this, I have installed the newest versions of Sync and iChunUtil, but I haven't tried it again, yet.

This issue is being closed as a purge of issues due to the Morph rewrite to 1.12.2 finally being released. Support for the 1.7.10 version has long been dropped and focus has shifted to the 1.12.2 version of the mod instead.