Couldn't process release.: Sequence contains more than one element

Version 2.0.0.5252

Mono Version 4.6.1
OS: Mac 10.14
Debug logs:
Description of issue:
Many episodes downloaded, sonarr not processing ANY episodes. Getting the following error.

System.InvalidOperationException: Sequence contains more than one element
  at System.Linq.Enumerable.SingleOrDefault[TSource] (System.Collections.Generic.IEnumerable`1[T] source) [0x0009e] in /private/tmp/source-mono-4.6.0-c8sr0/bockbuild-mono-4.6.0-branch-c8sr0/profiles/mono-mac-xamarin/build-root/mono-x86/mcs/class/referencesource/System.Core/System/Linq/Enumerable.cs:1113 
  at NzbDrone.Core.Tv.SeriesRepository.FindByTitle (System.String cleanTitle) [0x0001e] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Tv\SeriesRepository.cs:33 
  at NzbDrone.Core.Tv.SeriesService.FindByTitle (System.String title) [0x00000] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Tv\SeriesService.cs:82 
  at NzbDrone.Core.Parser.ParsingService.GetSeries (NzbDrone.Core.Parser.Model.ParsedEpisodeInfo parsedEpisodeInfo, System.Int32 tvdbId, System.Int32 tvRageId, NzbDrone.Core.IndexerSearch.Definitions.SearchCriteriaBase searchCriteria) [0x000d4] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Parser\ParsingService.cs:257 
  at NzbDrone.Core.Parser.ParsingService.Map (NzbDrone.Core.Parser.Model.ParsedEpisodeInfo parsedEpisodeInfo, System.Int32 tvdbId, System.Int32 tvRageId, NzbDrone.Core.IndexerSearch.Definitions.SearchCriteriaBase searchCriteria) [0x0000d] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Parser\ParsingService.cs:74 
  at NzbDrone.Core.DecisionEngine.DownloadDecisionMaker+<GetDecisions>d__6.MoveNext () [0x0016d] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\DecisionEngine\DownloadDecisionMaker.cs:79 

Please post the debug logs as requested. That will show which series it’s attempting to find.

Please upload the log and link it here… (this was all in the template when you opened the thread).

I also manually verified that there are no duplicate episodes downloaded in that directory.

Looks like you have multiple series named FBI or F.B.I., possibly duplicates that have been removed on The TVDB?

Removing one should resolve it.

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