Dunno why, but this happened, so.
https://paste.dimdev.org/abawotifin.mccrash

Same.

@MrCrayfish Hope This helps.
The Error Is nullPointerExeption
I have found the line which appears at the start of stacktrace and its in Object.Bullet.java at line 55. this is the line that caused the crash "Entity entity = world.getEntityByID(this.entityId);"
the second line is in client.event.RenderEvents.java at line 1040. this is the line "bullets.forEach(bullet -> bullet.tick(Minecraft.getMinecraft().world));"