server crash error: Exception in server tick loop

[soulhakr]

Hey, I seem to get getting a fatal server error coming from HeartDrops.
Here's the pastebin of the crash log: https://pastebin.com/uY8BZs7u
Any ideas on how I might go about investigating further?

[DeflatedPickle]

Sorry, I just saw this.

The line this error points to is the end curly brace in this statement.

HeartDrops/src/main/kotlin/com/deflatedpickle/heartdrops/event/ForgeEventHandler.kt

Lines 84 to 91 in 4895432

	ForgeRegistries.POTIONS.valuesCollection.filter { !it.isInstant && !it.isBadEffect }.toList().apply {
	PotionUtils.appendEffects(event.entityItem.item, mutableListOf(PotionEffect(
	this[HeartDrops.random.nextInt(this.size)],
	// It should last for *enough* time to get use out of it
	// TODO: Make crystal heart effects further customisable
	HeartDrops.random.nextInt(20 * 20, 20 * 30)
	)))
	}

The error is a java.lang.NoSuchMethodError, which doesn't make sense to me. The only function that are called on the object are for each potion are getters to some of their properties.