Determine Type Of Data Of Right Click Parameter

I need to make a fork in my code based on the type of data received from an input box launched from a right click and passed via the actioncontrol parameter.

The input box box is a range selector.

Dim seriesIdArray As Variant
seriesIdArray = Range(CommandBars.ActionControl.Parameter)

Generally, the user will have selected multiple cells as their range and I loop through using:

For j = 0 to ubound(seriesIdArray, 2)

However, if they only select one cell, I am getting back the value of that string in seriedIdArray, and that gives me a type mismatch error. I'll need to handle this a little differently, and I know how to do that part, I just don't know when I need to do this.

How can I tell whether they have selected one cell or multiple cells based on the value of the actioncontrol parameter?

I considered trapping the error type (13) and branching based on that, but then I end up with spaghetti code and I'm trying to avoid that.

I think I may need to create another more specific variable to take the action control parameter, test it, and then decide whether I should use an array or a range, but that's just a suspicion.