When I unmute a player, it works but I get this error at the console, is this normal? http://prntscr.com/lsv04j

Hey, thanks for reporting.

I will have a look.

Merged post

Fixed it, seems I forgot a required parameter. (Odd, as I thought I had actually added it before releasing.. Oh well.)

Hey, thanks for fixing it. Btw, I'm having a similar thing when killing a player. It works but I get these errors http://prntscr.com/lt3zib

I'll see what I can find. :)

Merged post

Question, are you using the GUI or the command via RCON?
Everything in this plugin will NOT work with RCON, as I rely on the player using it, so I can verify the permissions properly.

ThibmoRozier i have this too:

(19:23:07) | Failed to call hook 'API_Unmute' on plugin 'BetterChatMute v1.1.2' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.BetterChatMute.API_Unmute (Oxide.Core.Libraries.Covalence.IPlayer target, Oxide.Core.Libraries.Covalence.IPlayer player, System.Boolean callHook, System.Boolean broadcast) [0x00044] in <fed70d3072d44811bd0d34dbdefbf336>:0 
  at Oxide.Plugins.BetterChatMute.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00427] in <fed70d3072d44811bd0d34dbdefbf336>: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​

This should be fixed in v1.3.21, did you update to that version?
Also, all these commands will not work from RCON.