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check if a variable is null or not, on sequence flows

Question asked by viravira on Aug 19, 2013
Latest reply on Aug 21, 2013 by trademak
On a sequenceFlow, I want to check a condition which may include a variable that may not be defined yet in process instance.
so if it's not defined, I dont want to get ActivitiException of "the variable is not defined", but want the flow to proceed.

I wrote my condition like this:

${ A == null || A.a >= B.b }

then when A is null (not defined yet) I cant proceed :/

what should I do?