General Information
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• I play...
  • With a large modpack
  • Only with CQR and it's dependencies
• The issue occurs in...
  • Singleplayer
  • Multiplayer
• I have searched for this or a similar issue before reporting and it was either (1) not previously reported, or (2) previously fixed and I'm having the same problem.
• I am using the latest version of the mod (all versions can be found on github under releases)
• I read through the FAQ and I could not find something helpful (FAQ)
• I reproduced the bug without any other mod's except forge, cqr and it's dependencies
• The game crashes because of this bug

Describe the bug
Note: This error only occurs with the VanillaFix mod and does not crash the game.
Trading with a Chocolate Quest NPC yields an error when attempting to trade with that NPC.

To Reproduce
Steps to reproduce the behavior:

1. Create a trade with a Chocolate Quest NPC.
2. Trade with the NPC. It'll allow you to trade, and everything appears to function correctly, but it'll yield an error each time you trade.

Versions (Note that 'latest' is NOT a valid version!
Chocolate Quest Repoured: 1.12.2-2.6.5B
Forge: 1.12.2-14.23.5.2860
Minecraft: 1.12.2
Other mods (necessary to reproduce the bug): VanillaFix

Log File
https://pastebin.com/RDCfBjJT

My trade parameters:

Patched in 2.6.6B

if it is an issue with vanillafix report it to them and not us.

Actually if you would've looked at the error and tested without vanilla fix you would've seen taht this has nothign to do with a certain trader or vanillafix. The problem is that this is an edge case when there no trade it could restock and it attempts to restock.