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NULLREF
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An object (a singleton) and not a class. It represents the NULL reference, and could occur, for example, when you intersect two disjoint ranges, or when a formula depends on a cell that has been deleted. For example, when you put in some cell =test(B5) and then right-click on column B and delete it. To test when something is the NULL reference, just do x === NULLREF.

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