Grails: Error while applying criteria Query -

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i applying criteria query find sum of columns , save result in long format. when there data in table, working fine, in case no match records found, following error thrown:

cannot cast object 'null' class 'null' class 'long'**

my code is:

long referralpoints = referraldetail.createcriteria().get {     eq('referredby', user)     projections {         sum('referralpoints')     } }

use long instead of long. primitives cannot null.


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