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[1.7.10]Ticking Entity crash when opening a saved world


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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.

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