Hextech Crafting Bug; Chest and Key disappear

So this is the second time this happened. Sometimes when I go to open a chest in Hextech Crafting, after i press on the key beneath the chest no animation appears. Usually there is this sound effect and the chest opens but now just nothing happens. Then I close the hextech window to try again and the key and chest are gone, without me receiving a champion shard, skin shard, emote or ward skin. This happened twice in maybe half a year and its a bit frustrating. Did anyone run into the same problem or know how it is caused? PS: Next time I'll try to take a screenshot when it happens, the previous times I was too fast with closing the window before thinking of taking a screenshot.
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