I lost my friends list

Hello, Today after I update lol client (even during updating a client ) I found out that my friend list completely vanish (Only one person left) and I think that this is not a bug, because I had my friend in our social, but to have him again on my list I must to invite him again. Is it possible to restore my friend list?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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