{"action":"created","issue":{"url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/238","repository_url":"https://api.github.com/repos/aspnet/SignalR-Server","labels_url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/238/labels{/name}","comments_url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/238/comments","events_url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/238/events","html_url":"https://github.com/aspnet/SignalR-Server/issues/238","id":183662978,"number":238,"title":"SignalR Core server crashes on client connect (NullReferenceException)","user":{"login":"Alexlander","id":11189629,"avatar_url":"https://avatars.githubusercontent.com/u/11189629?v=3","gravatar_id":"","url":"https://api.github.com/users/Alexlander","html_url":"https://github.com/Alexlander","followers_url":"https://api.github.com/users/Alexlander/followers","following_url":"https://api.github.com/users/Alexlander/following{/other_user}","gists_url":"https://api.github.com/users/Alexlander/gists{/gist_id}","starred_url":"https://api.github.com/users/Alexlander/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Alexlander/subscriptions","organizations_url":"https://api.github.com/users/Alexlander/orgs","repos_url":"https://api.github.com/users/Alexlander/repos","events_url":"https://api.github.com/users/Alexlander/events{/privacy}","received_events_url":"https://api.github.com/users/Alexlander/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2016-10-18T11:43:16Z","updated_at":"2016-11-02T14:05:11Z","closed_at":null,"body":"I've ported a SignalR mono server to run with SignalR Core on **Debian**, it runs correct on startup, but when a web or C# client joins it crashes with the following error:\n\n> Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.\n>    at Microsoft.AspNetCore.SignalR.Messaging.MessageBus.GarbageCollectTopics()\n>    at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\n>    at System.Threading.TimerQueueTimer.CallCallback()\n>    at System.Threading.TimerQueueTimer.Fire()\n>    at System.Threading.TimerQueue.FireNextTimers()\n> Aborted\n\nAnd on the web-client it gives me: 500 Internal Error.\n\nI just followed this tutorial https://radu-matei.github.io/blog/signalr-core/ , without changing my clients and hubs code.\n\nI also use an Apache reverse proxy like this ProxyPass /signal http://localhost:5000\n\nAny help/tips where to look are appreciated 😄 \n"},"comment":{"url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/comments/257873726","html_url":"https://github.com/aspnet/SignalR-Server/issues/238#issuecomment-257873726","issue_url":"https://api.github.com/repos/aspnet/SignalR-Server/issues/238","id":257873726,"user":{"login":"nbattaglia","id":22792525,"avatar_url":"https://avatars.githubusercontent.com/u/22792525?v=3","gravatar_id":"","url":"https://api.github.com/users/nbattaglia","html_url":"https://github.com/nbattaglia","followers_url":"https://api.github.com/users/nbattaglia/followers","following_url":"https://api.github.com/users/nbattaglia/following{/other_user}","gists_url":"https://api.github.com/users/nbattaglia/gists{/gist_id}","starred_url":"https://api.github.com/users/nbattaglia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nbattaglia/subscriptions","organizations_url":"https://api.github.com/users/nbattaglia/orgs","repos_url":"https://api.github.com/users/nbattaglia/repos","events_url":"https://api.github.com/users/nbattaglia/events{/privacy}","received_events_url":"https://api.github.com/users/nbattaglia/received_events","type":"User","site_admin":false},"created_at":"2016-11-02T14:05:11Z","updated_at":"2016-11-02T14:05:11Z","body":"Hello Alexlander! I'm trying to do some like you in Bluemix with Ubuntu, and get same error. with netcore 1.0.1. have you gote some usefull results about this issue?"}}
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