Getting this error when trying to reset/clear a coloured name 

(09:51:11) | Failed to call hook 'cmdNameColour' on plugin 'ColouredChat v2.1.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Game.Rust.Libraries.Player.Message (BasePlayer player, System.String message, System.String prefix, System.UInt64 userId, System.Object[] args) [0x00038] in <40394e96ea4a461497fd902b2ed74f3b>:0 
  at Oxide.Game.Rust.Libraries.Covalence.RustPlayer.Message (System.String message, System.String prefix, System.Object[] args) [0x00000] in <40394e96ea4a461497fd902b2ed74f3b>:0 
  at Oxide.Game.Rust.Libraries.Covalence.RustPlayer.Reply (System.String message, System.String prefix, System.Object[] args) [0x0000f] in <40394e96ea4a461497fd902b2ed74f3b>:0 
  at Oxide.Game.Rust.Libraries.Covalence.RustPlayer.Reply (System.String message) [0x00008] in <40394e96ea4a461497fd902b2ed74f3b>:0 
  at Oxide.Plugins.ColouredChat.ProcessColour (Oxide.Core.Libraries.Covalence.IPlayer player, Oxide.Core.Libraries.Covalence.IPlayer target, System.String colLower, System.String[] colours, System.Boolean isMessage, System.String groupName) [0x003f9] in <f97ad21743e54ed1a2f86ceb9c627c28>:0 
  at Oxide.Plugins.ColouredChat.ProcessColourCommand (Oxide.Core.Libraries.Covalence.IPlayer player, System.String cmd, System.String[] args, System.Boolean isMessage) [0x00150] in <f97ad21743e54ed1a2f86ceb9c627c28>:0 
  at Oxide.Plugins.ColouredChat.cmdNameColour (Oxide.Core.Libraries.Covalence.IPlayer player, System.String cmd, System.String[] args) [0x00000] in <f97ad21743e54ed1a2f86ceb9c627c28>:0 
  at Oxide.Plugins.ColouredChat.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00b58] in <f97ad21743e54ed1a2f86ceb9c627c28>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

Sounds like the player was not online at the time, so the plugin would have to check for that before trying to send a message.