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    Nintex Knowledge Base

    Error "System.NullReferenceException: Object reference not set to an instance of an object"

    Summary
    When a task is assigned to a user using the UPN account property, the following error might occur: Nintex.Workflow.NWActionExecutionException: Error in task. ---> System.NullReferenceException: Object reference not set to an instance of an object.

    Solution
    In environments where the UPN property is being used as the primary ID, it should be converted into a domain\username property in a workflow first before then using this to assign a task.