Fixed tuning issue

Server/Managers/TuningManager.cs

@@ -90,6 +90,15 @@ namespace reallife_gamemode.Server.Managers
                 }
                 else
                 {
+                    if (vMod == null)
+                    {
+                        vMod = new VehicleMod
+                        {
+                            ServerVehicleId = sV.Id,
+                            Slot = slot
+                        };
+                        dbContext.VehicleMods.Add(vMod);
+                    }
                     vMod.ModId = index;
                 }
                 dbContext.SaveChanges();