User PlayerRef as alias in update quest

source/scripts/EnderalUpgradeAlias.psc

@@ -8,6 +8,11 @@ Event OnInit()
 
 	; MQP01
 	if (Game.GetForm(0x46F1A) as Quest).GetStageDone(10)
+	
+		While Utility.IsInMenuMode()
+			Utility.WaitMenuMode(0.1)
+		EndWhile
+	
 		Debug.MessageBox("A savegame was loaded which was made before the release of Enderal SE 2.1. In this save, several new features won't be available and there is a chance that you'll encounter grave bugs. Please, start a new game.")
 		;Game.QuitToMainMenu()
 	endif