Using this code: (BiomeEmiStack is my own class)

    @Override
    public void initialize(EmiInitRegistry registry) {
        Registry<Biome> biomeRegistry = Minecraft.getInstance().level.registryAccess().registryOrThrow(Registries.BIOME);

        registry.addRegistryAdapter(EmiRegistryAdapter.simple(Biome.class, biomeRegistry, BiomeEmiStack::of));
    }

Produces this error upon joining a world:

[20:10:00] [Thread-12/ERROR] (EMI) [EMI] java.lang.NullPointerException: Cannot invoke "net.minecraft.core.Registry.getTag(net.minecraft.tags.TagKey)" because "registry" is null
	at dev.emi.emi.EmiUtil.values(EmiUtil.java:63)
	at dev.emi.emi.registry.EmiTags.reloadTags(EmiTags.java:249)
	at dev.emi.emi.registry.EmiTags.reload(EmiTags.java:243)
	at dev.emi.emi.runtime.EmiReloadManager$ReloadWorker.run(EmiReloadManager.java:171)
	at java.base

Full log:
latest.log

Versions used:

• emi 1.1.5+1.20.1+fabric
• fabric-api 0.91.0+1.20.1
• fabricloader 0.14.25
• java 17
• minecraft 1.20.1

still occurs on 1.1.6+1.19.2

Should be resolved in the latest release

Can you upload a log? I thought I fixed this and marked it as fixed in 1.1.7 but I don't think I actually did

tested with EMI 1.1.7+1.19.2, still occurs. log attached
latest.log

I found out why it was difficult to debug this, it was working on all versions except 1.19.2 specifically, should be resolved in 1.1.10