I  ========== CompleteTutorialStep END ==========
                         E  NullReferenceException: Object reference not set to an instance of an object.
                         E    at OpenUnitsWindowStep.OnShow () [0x00000] in <00000000000000000000000000000000>:0
                         E    at TutorialWindow.OnShowEnd () [0x00000] in <00000000000000000000000000000000>:0
                         E    at WindowsManager.ShowWindow[T] (System.Object updateInfo) [0x00000] in <00000000000000000000000000000000>:0
                         E    at WindowsManager.OnNewTutorialStep (TutorialAction currentAction) [0x00000] in <00000000000000000000000000000000>:0
                         E    at TutorialManager.CompleteTutorialStep (TutorialAction tutorialAction) [0x00000] in <00000000000000000000000000000000>:0
                         E    at ZombieManager.OnZombieDied (ZombieController controller, Zombie zombie) [0x00000] in <00000000000000000000000000000000>:0
                         E    at Zenject.Signal`3[TDerived,TParam1,TParam2].Fire (TParam1 p1, TParam2 p2) [0x00000] in <00000000000000000000000000000000>:0
                         E    at ZombieCollection.OnZombieDied (ZombieController controller, Zombie model) [0x00000] in <00000000000000000000000000000000>:0
                         E    at ZombieController.ZombieMod