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Static DevStatic Dev 

Error in process builder for object cross reference


I have developed a process builder on case object, Which cross refers to opportunity. Issue i am having right now is when i am trying to check the a picklist value blank on opportunity it's throwing a flow error and i am getting emails.

Below is the error fro flow Error element myDecision (FlowDecision).
The flow failed to access the value for myVariable_current.Opportunity_del__c.Status_c__c because it hasn't been set or assigned.
Status is picklist value i am checking it to be blank in PB.
ISPICKVAL( [Case].Opportunity_del__c.Status_c__c, ""),
I am using PB criteria as conditions are met. Please let me know how to handle this.

Thanks in advance