Check if a row is NULL

Hi All,
I am trying to read a cell and then have an IF- flow based on the value ( NULL or NOT )

I tried the following:

reading a cell - converting the variable to string - getting the length if the string- check if length=0

I get the following error both times:

FILE has thrown an exception

Message: Object reference not set to an instance of an object. This error usually occurs when using a variable with no set value (not initialized).

Source: If

Exception Type: NullReferenceException

isNothing(<GenericValue Read Cell variable>)

if false, Convert to String

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