Unable to connect to indexer: Object reference not set to an instance of an object

Sonarr version (exact version): 2.0.0.5228
OS: Windows 10
Debug logs: System.NullReferenceException: Object reference not set to an instance of an object. at NzbDrone.Core.Indexers.BroadcastheNet.BroadcastheNetParser.CleanReleaseName(String releaseName) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\BroadcastheNet\BroadcastheNetParser.cs:line 98 at NzbDrone.Core.Indexers.BroadcastheNet.BroadcastheNetParser.ParseResponse(IndexerResponse indexerResponse) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\BroadcastheNet\BroadcastheNetParser.cs:line 62 at NzbDrone.Core.Indexers.HttpIndexerBase`1.FetchPage(IndexerRequest request, IParseIndexerResponse parser) in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\HttpIndexerBase.cs:line 308 at NzbDrone.Core.Indexers.HttpIndexerBase`1.TestConnection() in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\Indexers\HttpIndexerBase.cs:line 334
Description of issue: BTN not working in Sonarr. Fails when clicking test connection also. API key is correct.

Currently having this exact same issue. Been happening on and off for a few days, sometimes a restart fixed it, but now it seems to be hard broken.

Same issue for me started today.

OS: Ubuntu 18.04
Using Docker linuxserver/sonarr:latest
Version 2.0.0.5228
Mono Version 5.14.0.177

Looks like BTN is sending back an invalid release name, in this case empty/null. That definitely is unexpected and causing Sonarr to fail when parsing the RSS feed.

This was an API issue at BTN. They have fixed it now.

Here’s the thread on their forums:
https://broadcasthe.net/forums.php?action=viewthread&threadid=24100

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