Mystery Snowball icon BUG

Hello. Today i tried to send a gift to a friend of mine, but i can't send her the gift. I want to give her a snowball mystery icon but this error comes up: (i posted a link). She's been playing since season 3 or something, anyway for a very long time, she was gold II at a time. What could be the problem? I bet she owns more than 10 champions but i don't see any connection between the need of owning 10 champions to receive a icon. Can someone help me out with this problem please? Thank you.
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