The summoner name or tag is incorrect
thunder #0002
SILVER I
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 20
205,566
lvl: 12
115,424
lvl: 11
135,357
lvl: 10
103,025
lvl: 8
67,967
lvl: 7
64,676
lvl: 6
36,019
lvl: 5
21,733
lvl: 4
19,623
lvl: 4
18,001
lvl: 4
17,318
lvl: 3
7,824