Formula Error

I have a formula
if (isnull ({MembersDetails.Medical Conditions})) then 'None recorded' else ({MembersDetails.Medical Conditions})

But is does not work
The field in the database is completely blank, so is the problem that I am saying 'isnull'
How do I correct this?
Gordon HughesDirectorAsked:
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NorieAnalyst Assistant Commented:

It might be an empty string rather then Null, you could check for that, as well as Null, like this.

if isnull ({MembersDetails.Medical Conditions}) or {MembersDetails.Medical Conditions} = ""  then 'None recorded' else ({MembersDetails.Medical Conditions})

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Éric MoreauSenior .Net ConsultantCommented:
which syntax? Basic or Crystal?
It could be the problem.  Is the field NULL or is it the empty string ''
NULL is the absence of a value. The Empty string is a defined value

DO you have the option DEFAULT FOR NULL checked in the formula editor?

Building on the above comment it may need a minor correction depending on what is in the field

If isnull ({MembersDetails.Medical Conditions}) or 
            Trim({MembersDetails.Medical Conditions}) = ""  then 
                    'None recorded' 
       {MembersDetails.Medical Conditions}

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Gordon HughesDirectorAuthor Commented:
All sorted
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