How to get CF formula to skip if lookup cell is blank.

Hello all,

I currently have a conditional format formula which simply compares one cell to another and colours the cell in the appropriate colour. How do I get the formula to "skip" if the lookup cell is blank?

The formula is:

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So if AF2 is blank, I want it to ignore the formula.

So should it be something like:

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?

Thanks. I just tried it but VBA Editor is saying the first '$' is an invalid character?

The full line is:

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