Approval flow showing error due to Null value in attribute in the rule

Summary:

We had submitted a Name change for an inactive employee in Production Instance. The approval got failed and showed the below error

The rule set for Change Personal Information Process Name is below:

((transactionApprovalRequest.transactionId > 0) AND ((Worker's Assignment.result.legalEntity == "SVKMs NMIMS Deemed to be University") OR (Worker's Assignment.result.legalEntity == "SVKM NMIMS Global University")))

The employee is from Legal Entity→ SVKMs NMIMS Deemed to be University.

How to add a Null check condition in this rule?

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