Versions
Minecraft Version: 1.16.5
Minecraft Forge Version: 36.1.61
Mod Version: 2.0.0

Log files
Crash report: https://gist.github.com/faeldray/17ef4728f6cc8f2efe59b26e6a48011c

Describe the bug
After loading a single player game where I had a selectable painting in my inventory, whenever I moused over the painting, the game would crash. The painting had been "configured" (AKA I had selected a particular painting during my previous session). The selected painting was a modded one if that matters.

To Reproduce
Steps to reproduce the behaviour:

1. Start a new SP game and get a selectable painting.
2. Choose a painting.
3. Exit and reload the game.
4. Mouseover the painting.
5. Client crashes.

Expected behaviour
No crashes when mousing over the painting.

Issue confirmed for:

• Minecraft version: 1.16.5
  Forge: 36.2.2
  Mod version:  2.0.0
  Macaw's Paintings: 1.0.2
  Infernal Expansion: 1.3

TODOs:

• Testing via Minecraft 1.16.5 and Forge 36.2.0 with mod version 2.0.0
• Testing with Minecraft 1.16.5, Forge 36.2.2, mod 2.0.0, Macaw's Paintings 1.0.2 and Infernal Expansion 1.3

Which mod added the modded paintings?

I can't remember which painting I choose but I just did another test and I got the same crash with paintings from both Infernal Expansion and Macaw's Paintings.

I did notice that if the painting size I had chosen also had vanilla paintings of the same size, a vanilla painting would be selected when I loaded the game. But if the painting size only had modded paintings, that would cause it to crash instead.

I was able to get the same crash with a much smaller mod list to reduce the chances of some weird interaction. I discovered that if I just had one mod that adds paintings (ie. either Infernal Expansion or Macaw's Paintings), when I loaded the game for the second time, the selectable painting would revert to a vanilla painting without issue. But if I had more than one mod that adds paintings (ie. both Infernal Expansion and Macaw's Paintings), that's when I would get the crash.

Crash report: https://gist.github.com/faeldray/9d722c43ec1a83078502851348d576b0

I've implemented a fix. Please test, if this fix works for you.
I will release this, if I get a positive response.
SelectablePainting-1.16.5-2.0.1.zip

Sorry it took me so long to test this. I just did though and no more crashes!

Fixed with version 2.0.1