Exit code -1 crash

Hey, I play Valhelsia 6 from CurseForge and when I try to get into my world ive spent a lot of hours in, it crashes and i get an error code called exite code -1. I have no idea what to do. Please help me. This is what i get as an error description:

Description: Ticking entity

java.lang.NullPointerException: Cannot invoke "net.minecraft.sounds.SoundEvent.m_215668_(float)" because the return value of "net.minecraft.core.Holder.m_203334_()" is null

I have the full crash report in case somebody would want to help.