Description of the issue:

When OptiFine is installed alongside IE, the game crash on world load due to something related to mixin.

This crash does not happens in a fresh install with only IE.

Crashlog:

No crash log was generated, but here is the latest.log:
latest.log

Versions & Modlist

Modlist: https://www.toptal.com/developers/hastebin/pubotilaye.apache

Oops, didn't saw it was already reported. Closing as duplicate.

#5247