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NullReferenceException(orNullPointerException,TypeError, ...) that means unexpected null. This is exactly the situation that nullable types I'm talking about (andOptiontypes, of course) are here to preventunsafeblocks do not allow you to dereferenceNULL(usually the pointer to the memory location0x00000000). They allow you to circumvent a few compiler checks, including the restriction on dereferencing arbitrary pointers (which could potentially be0, akaNULL).