Web request produced exception (Url: http://steamcommunity.com/groups/-templargaming/memberslistxml/?xml=1&p=1) in 'SteamGroups v0.4.1' plugin (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Core.Libraries.WebRequests+WebRequest.b__40_0 (System.IAsyncResult res) [0x00000] in :0 ​

That error simply means that a webrequest was in progress, and was interrupted by the reload.