boss not showed up(daily story token)

i forgot the name, maybe hungry the big troll or else, in the story scenario after defeating all enemies, we must try open the treasure chest to spawn the big troll right?, but this time after i try open the treasure chest, there is pop up singing of the.... bard the story teller, then i close the pop up and there is no troll spawning like in normal condition, but i thought it was my connection , so i wait about 5 minutes, and still no troll so i quit and start over the scenario and this time the troll showed up....
im really sorry if this problem caused by my own mistake..