Describe the crash
Killing an Iceologer with a glass sword causes a crash log to be created.

To Reproduce
Steps to reproduce the behavior:

1. Summon an Iceologer.
2. Kill the Iceologer with a glass sword.
3. View the crash log created.

Crash Log
[Get link failed]
https://pastebin.com/zk5QaN33

Info (please complete the following information):

• Modpack Version:
  • 2.77.5
  • 3.0 BETA 4
  • Other:
• Server or Singleplayer:
  • Server
  • Singleplayer
• Version the world was created on:
  • 2.77.5
  • 3.0 BETA 4
  • Other:

duplicate of #539