Analytics - IF formulas

Analytics - IF formulas

Hi there, 
I'd like to create a formula to calculate the duration between 2 session time, but also return null if the duration is > 30 minutes (reason : these are false value, bug related, don't want to display them...)

So I tried
If('Timediff("sessionEnd","sessionStart")' > '00:30:00','null','Timediff("sessionEnd", "sessionStart")')

but I only get null result, even when duration is less than 30min.
Anyone know how to solve this ?
Cheers
Olivier

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