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Bug
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Resolution: Fixed
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1.15.1, 1.15.2 Pre-release 2
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None
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Minecraft 1.15.2 Pre-release 2, Yarn v2 1.15.2-pre2+build.1 (Decompiled in IDEA with FernFlower)
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Plausible
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Crash
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Normal
The bug
This bug report is based off of Minecraft 1.15.2 Pre-release 2 with Yarn names and decompiled with FernFlower.
EntityType$Builder#build(String id) tries to get a datafixer for the entity before creating the type, and continue even if it is unable to get the fixer.
The vanilla code looks like this:
public EntityType<T> build(String id) { if (this.saveable) { try { Schemas.getFixer().getSchema(DataFixUtils.makeKey(SharedConstants.getGameVersion().getWorldVersion())).getChoiceType(TypeReferences.ENTITY_TREE, id); } catch (IllegalStateException var3) { if (SharedConstants.isDevelopment) { throw var3; } EntityType.LOGGER.warn("No data fixer registered for entity {}", id); } } return new EntityType(this.factory, this.category, this.saveable, this.summonable, this.fireImmune, this.spawnableFarFromPlayer, this.size); }
Vanilla catches an IllegalStateException, but the actual exception that is thrown by Schema#getChoiceType is IllegalArgumentException. This means that if an EntityType is built for an entity that doesn't have a type, the game will fail hard and crash.
Recommended change:
...
} catch (IllegalArgumentException var3) {
...