"User Data: " Chat Bug

Just finished playing an Ascension game where everything was normal except for occasionally the words "User Data" followed by various numbers and letters would appear. I'm not entirely sure of the cause, just that it occurred. The champions present were Akali, Shaco, Lissandra, Kha'Zix, and Pantheon vs. Akali, Alistar, Shen, Yasuo, and Caitlyn.
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