Final Close Date Default Autocomplete Rule throwing Null Point Error on Hire

Summary:

We created a simple rule on Element Duration Date BO to default the Final Close Date 60 days after termination date. It is throwing the below error on Hiring and Adding pending worker. Please help

Content (please ensure you mask any confidential information): FORD USE CASE 69

Version (include the version you are using, if applicable):24C

Code Snippet (add any code snippets that support your topic, if applicable):