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So I've found that my custom flying entity (like a snowball) will crash a world if it is present in it when I exit the world. When I go to open the world, a null pointer exception happens and the game crashes. Basically, when the world saves, it doesn't save a certain value, which is then called on in the onUpdate() method, and causes a null pointer error. Is there anyway to tell the server to save that value when shutting down? Otherwise, it there a way to tell when the server is shutting down so I can just set all those entities to dead before? I figured this didn't need any code, but if I'm wrong just ask me to post it.

You have to save the value to NBT in the writeToNBT method and read it when opening the world in the readFromNBT method.

Check out my mod, Realms of Chaos, here.

 

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