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NULLREF
NULLREFPremium
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
.