As i was summoning a building (cristal production ("Antre de Cristal" in french)) i wanted to cancel it. I got no message telling me what i would loose, but rather got a white screen with the game code at the url "https://int1.xhodon2.com/game/summon.php" and as i got back in the game the summoning was cancelled.
I did it again (with another building) and i got the same result.