Agraal does not spawn and causes a script error.

Game: Heroes of Might and Magic. Complete Gold Edition. In the campaign for the queen, in the mission: Sunset of the King (fifth mission). When freeing the queen, the following appears in the console: script error: Hero "Agrael" is not on map. Because of this, the map cannot be completed; Agrael does not attack, and the game becomes endless. Are there any ways to fix this?