"Unlock your first champion" bug

After ending the first part of the tutorial, appears a window to unlock the first champion but there is nothing to pick and the OK button is blocked. Problem is that even after restarting game/computer and logging in into this account, it always appear this window. What can be done to solve this?

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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