Null Exception

[Europesky]

Dear all, i receiving the following error when starting the SaltyChat ressource on my server:

[12:48:24] exception at event:SaltyChat:EnablePlayer:System.ArgumentNullException: Value cannot be null. (Parameter 'input')
at System.Text.RegularExpressions.ThrowHelper.ThrowArgumentNullException(ExceptionArgument arg)
at System.Text.RegularExpressions.Regex.Replace(String input, String replacement)
at System.Text.RegularExpressions.Regex.Replace(String input, String pattern, String replacement)
at SaltyChat.Server.VoiceManager.GetTeamSpeakName(IPlayer player) in C:\Users\Thomas\Desktop\altV-Script-master\Altv-Roleplay\SaltyServer\VoiceManager.cs:line 318
at SaltyChat.Server.VoiceManager.OnServerEnablePlayer(IPlayer player) in C:\Users\Thomas\Desktop\altV-Script-master\Altv-Roleplay\SaltyServer\VoiceManager.cs:line 143

Im using Teamspeak Version 3.13.6 and Alt V Version 14.64 - what can i do to fix?

Here are the mentioned lines in voice manager:

143: if (_voiceClients.ContainsKey(player)) _voiceClients[player] = voiceClient;
318: name = Regex.Replace(name, @"({serverid})", player.Id.ToString());

Thank you very much for your help