The following error has been happening periodically for months.  Really think an update is needed somewhere, hasn't been one in two years it says here on umod:

Better Chat: Errored On Hook: OnPlayerChat
System.InvalidOperationException: Chat channel is set to Team, however the player is not in a team.
at Oxide.Plugins.BetterChat.SendBetterChatMessage (Oxide.Plugins.BetterChat+BetterChatMessage chatMessage, ConVar.Chat+ChatChannel chatchannel) [0x0014b] in <772080cc71764bc38b1f93124d9be25a>:0
at Oxide.Plugins.BetterChat.OnPlayerChat (BasePlayer bplayer, System.String message, ConVar.Chat+ChatChannel chatchannel) [0x00041] in <772080cc71764bc38b1f93124d9be25a>:0
at Oxide.Plugins.BetterChat.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x000ed] in <772080cc71764bc38b1f93124d9be25a>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d59b507fd76240e5b62228d0eae39b73>:0
at (wrapper dynamic-method) MonoMod.Utils.DynamicMethodDefinition.Oxide.Core.Plugins.Plugin.CallHook_Patch0(Oxide.Core.Plugins.Plugin,string,object[])
Total Errors: 7x