How to get IF statement not to include Null cells?

Good morning

I have the IF formula that you see below that sort of works… there are some cases where cell H18 will be Null so I don’t want “Stale” comment to be returned if the cell is Null. I don’t know what to add to what I have so it won’t count it….

Formula:

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IF(AND(H18<TODAY()-365,H18<>""),"Stale","")