fix error in taxi updatefare

ReallifeGamemode.Server/Job/TaxiDriverJob.cs

@@ -123,9 +123,15 @@ namespace ReallifeGamemode.Server.Job
 
     public static void UpdateFare()
     {
+
       foreach (var player in GetPlayerInJob())
       {
         User u = player.GetUser();
+        if(u == null)
+        {
+          continue;
+        }
+
         if (u.JobId != 1) return;
         if (!player.HasData("hasPassager")) { player.SetData<bool>("hasPassager", false); continue; }
         int playerId = player.GetUser().Id;