Error when workflow comes to null value

Summary:

As a rule, I have the following condition

at least one

{RequestorDetails is a RequestorDetails and RequestorDetails.Job Level same or more than 3 }

but when it is from a certain BU it does not have a Job Level registration and the value is null.

Then the following ERROR happens:

Attempted to invoke method "doubleValue" in class "java.math.BigDecimal" on a null object reference. at line 28 column 13 in /Ruleset(ChangeSalaryApprovalRules)/Rule(PP_Gestor_All_BRA)/Pattern(v1_RequestorDetails)/Test[1]

Is there a possibility to treat the null value in the IF condition of the workflow?

Has anyone ever experienced this?