InvalidOperationException: system state is not initialized or has already been destroyed. How to fix?

Unity Engine
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1

I suddenly got this error when I play the game on the editor on the second time. The first play mode works fine, but after that I couldn’t play the game anymore because of this error unless I restart the editor. It’s very annoying.

I checked the code and the error is caused by this method in ComponentSystemBase:

internal SystemState* CheckedState()
{
    var state = m_StatePtr;
    if (state == null)
    {
        throw new InvalidOperationException("system state is not initialized or has already been destroyed");
    }
    return state;
}

I don’t know where it is assigned other than it is set to null in OnAfterDestroyInternal().

2

If you’re not doing domain reload, it’s probably some static state (yours or possibly some backend stuff) holding onto a stale system from a world that’s been destroyed.

The full stack trace would be useful. Version info for editor and packages always helps. We can’t make bricks without clay.

1 Like
3

I got it. There’s indeed one static that I forgot to reset.