Here is a crash log, I sent a crash log to Sophisticated Backpack

[Ninezel]

Version info
Java version:
Minecraft Forge version: 35.1.36

Describe the bug
I don't know what really is happening

To Reproduce
Steps to reproduce the behavior:

1. Pressed F5 while wearing a backpack from another mod

Expected behavior
A clear and concise description of what you expected to happen.

Mod list
Including versions, provided by crash report if game crashed:

Smallest sub-list that still produces issue, if any exclusion testing was done:

Log files
Here is a pastebin link: (https://pastebin.com/PqUyNEhE)

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

[EzerArch]

MPS is here now: https://github.com/lehjr/MachineMusePowersuits (by @lehjr)