KeyNotFoundException: The given key was not present in the dictionary

Получаю ошибку, когда попадаю по любому объекту на сцене:

KeyNotFoundException: The given key was not present in the dictionary.
System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) (at <695d1cc93cca45069c528c15c9fdd749>:0)
GameManager.GetPlayer (System.String _playerID) (at Assets/Scripts/GameManager.cs:39)
PlayerShoot.CmdPlayerShot (System.String _playerID, System.Int32 _damage) (at Assets/Scripts/PlayerShoot.cs:51)
PlayerShoot.CallCmdPlayerShot (System.String _playerID, System.Int32 _damage) (at <15d409b66be84a30afe6c008fd1cb636>:0)
PlayerShoot.Shoot () (at Assets/Scripts/PlayerShoot.cs:41)
PlayerShoot.Update () (at Assets/Scripts/PlayerShoot.cs:29)

Вот код самого скрипта:

using UnityEngine;
using System.Collections.Generic;

public class GameManager : MonoBehaviour
{
    public static GameManager instance;

    public MatchSettings matchSettings;

    private void Awake()
    {
        if (instance != null)
        {
            Debug.LogError("More than one GameManager in scene.");
        } else
        instance = this;
    }

    #region Player tracking

    private const string PLAYER_ID_PREFIX = "Player ";

    private static Dictionary<string, Player> players = new Dictionary<string, Player>();

    public static void RegisterPlayer(string _netID, Player _player)
    {
        string _playerID = PLAYER_ID_PREFIX + _netID;
        players.Add(_playerID, _player);
        _player.transform.name = _playerID;
    }

    public static void UnRegisterPlayer (string _playerID)
    {
        players.Remove(_playerID);
    }

    public static Player GetPlayer (string _playerID)
    {
        return players[_playerID];
    }

    //void ingui()
    //{
    //    guilayout.beginarea(new rect(200, 200, 200, 500));
    //    guilayout.beginvertical();

    //    foreach (string _playerid in players.keys)
    //    {
    //        guilayout.label(_playerid + " - " + players[_playerid].transform.name);
    //    }

    //    guilayout.endvertical();
    //    guilayout.endarea();
    //}

    #endregion

}