This was triggered by a falling block (in this case MineColonies Construction Tape) landing on a fruit leaves block. More details in crash report below.

• Forge Version: 1.15.2-31.2.0
• Mod Version: 1.15.2-1.3.0
• Can you reproduce this issue with relevant mods only?: N/A - passing this report on from somebody else who isn't as familiar with GitHub, the issue did not happen to me.

Crash Report:
https://gist.github.com/Vaelzan/d6f36534fab63e4d31e432c99ae257c1

Relevant Code:
https://github.com/Snownee/FruitTrees/blob/aee97e0199919ceffffb8a60240a0ed303ce2752/src/main/java/snownee/fruits/block/FruitLeavesBlock.java#L185