fix get set data nullreference

ReallifeGamemode.Server/Extensions/ClientExtension.cs

@@ -93,6 +93,11 @@ namespace ReallifeGamemode.Server.Extensions
 
     internal static T GetData<T>(this User user, string key, T nullValue)
     {
+      if(user == null)
+      {
+        return default;
+      }
+
       key += "data_";
       if (!user.Player.HasData(key)) return nullValue;
       return JsonConvert.DeserializeObject<T>(user.Player.GetData<dynamic>(key));
@@ -102,6 +107,11 @@ namespace ReallifeGamemode.Server.Extensions
 
     internal static void SetData(this User user, string key, object value)
     {
+      if(user == null)
+      {
+        return;
+      }
+
       key += "data_";
       user.Player.SetData(key, JsonConvert.SerializeObject(value));
     }