Exchange 2013 Event ID 4999

Hello,

I have two exchange servers 2013 both running MB and CAS roles. I also have a DAG on my servers. On one of my servers almost every 7-8 minutes I receive the following error event. Could you please assist me with this?

Event 4999, MSExchange Common

Watson report about to be sent for process id: 17084, with parameters: E12IIS, c-RTL-AMD64, 15.00.0995.029, MSExchangeMigrationWorkflow, unknown, M.E.M.L.L.<>c__DisplayClass11.<GetLocalServerData>b__10, System.NullReferenceException, 49af, unknown.
ErrorReportingEnabled: False 

Thanks a lot.

---

Pooriya Aghaalitari