error: [Exception] System.InvalidOperationException: Sequence contains no elements when sending email to an imported list

[Exception] System.InvalidOperationException: Sequence contains no elements
at System.Linq.Enumerable.First[TSource](IEnumerable`1 source)
at Blackbaud.Web.Content.Core.EmailJob.FlagOptOut(String sKey)
at Blackbaud.Web.Content.Core.EmailJob.FlagOptOuts()
at Blackbaud.Web.Content.Core.EmailJob.ProcessAddressees()
at Blackbaud.Web.Content.Core.EmailJob.DoProcessMailBlast()
at Blackbaud.Web.Content.Core.EmailJob.ProcessMailBlast()

May instead throw this error if the list is based on a Raiser's Edge Query:
Error refreshing list. Details: [System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at Blackbaud.RE7Service.MasterService.HandleRequest(Object oRequest, IRequestHandler oHandler, Boolean bUsesQuex) at Blackbaud.RE7Service.MasterService.GetPagedConstitData(GetPagedConstitDataArgs args) --- End of inner exception stack trace ---
We resolved this issue in version 6.10.81, patch 8. Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.

Environment

 6.10.81.5

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