AX2012 R3 ASync Client not pulling data back from the store

Got the following error this week at one of our retail stores:

Microsoft Dynamics AX Retail : Async Client CommerceDataExchangeAsyncClientServiceException when converting job defination to request header. Error Details: System.NullReferenceException: Object reference not set to an instance of an object.

This issue was resolved by changing the RERUN status on the UPLOADSESSIONS table back to None.