add null check to PeriodicTimer

2 files changed, 6 insertions, 1 deletions

diff --git a/MediaBrowser.Common/Threading/PeriodicTimer.cs b/MediaBrowser.Common/Threading/PeriodicTimer.cs
index cb562a80d..75ccada4e 100644
--- a/MediaBrowser.Common/Threading/PeriodicTimer.cs
+++ b/MediaBrowser.Common/Threading/PeriodicTimer.cs
@@ -14,6 +14,11 @@ namespace MediaBrowser.Common.Threading
 
         public PeriodicTimer(Action<object> callback, object state, TimeSpan dueTime, TimeSpan period)
         {
+            if (callback == null)
+            {
+                throw new ArgumentNullException("callback");
+            }
+
             Callback = callback;
             _period = period;
             _state = state;
diff --git a/MediaBrowser.Server.Implementations/Connect/ConnectEntryPoint.cs b/MediaBrowser.Server.Implementations/Connect/ConnectEntryPoint.cs
index 0d6b8ac26..12de5f6ef 100644
--- a/MediaBrowser.Server.Implementations/Connect/ConnectEntryPoint.cs
+++ b/MediaBrowser.Server.Implementations/Connect/ConnectEntryPoint.cs
@@ -44,7 +44,7 @@ namespace MediaBrowser.Server.Implementations.Connect
         {
             Task.Run(() => LoadCachedAddress());
 
-            _timer = new PeriodicTimer(null, new TimerCallback(TimerCallback), TimeSpan.FromSeconds(5), TimeSpan.FromHours(3));
+            _timer = new PeriodicTimer(TimerCallback, null, TimeSpan.FromSeconds(5), TimeSpan.FromHours(3));
         }
 
         private readonly string[] _ipLookups = { "http://bot.whatismyipaddress.com", "https://connect.emby.media/service/ip" };