Solved Failed to run a timer (Lua)

I will rediscover a theme

Code:

[Error] Failed to run a 60.00 timer in MyPlugin (NullReferenceException: Object reference not set to an instance of an object)
[Debug]   at Oxide.Core.Libraries.Timer+TimerInstance.Update () [0x00000] in <filename unknown>:0

Code:

-- in command
_P.MuteTimer[recipient] = timer.Repeat(60, mutetime, self:UnmuteTimer(recipient), self.Plugin)function PLUGIN:UnmuteTimer(player)
    playerID = rust.UserIDFromPlayer(player)
    if P.MutedTime[playerID] == 0 then
        rust.SendChatMessage(player, "Chat unblocked")
        return
    end
    P.MutedTime[playerID] = P.MutedTime[playerID] - 1
end

The mistake appears after passing of one minute

 

player?.net != null

 

After all something with the timer
[DOUBLEPOST=1437729923,1437485439][/DOUBLEPOST]Up

 

try

Code:

_MuteTimer[player] = timer.Repeat(10, 0, function()
self:UnmuteTimer(player)
end, self.Plugin)