It seems that Nyx causes a crash when starting Minecraft if Meteors are disabled, though this can be avoided by setting Meteor chances to zero instead of using the enabled/disabled setting.
java.lang.IllegalArgumentException: Item registered to item color handler cannot be null!
at net.minecraft.client.renderer.color.ItemColors.func_186730_a(ItemColors.java:165)
at de.ellpeck.nyx.events.ClientEvents.onColorRegistry(ClientEvents.java:115)
Thank you for your work!
It seems that Nyx causes a crash when starting Minecraft if Meteors are disabled, though this can be avoided by setting Meteor chances to zero instead of using the enabled/disabled setting.
Full crash report: https://pastebin.com/raw/jWfWZZ4G