The summoner name or tag is incorrect
fatal #0420
SILVER II
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 50
524,191
lvl: 46
477,870
lvl: 41
419,701
lvl: 30
307,505
lvl: 21
214,759
lvl: 20
231,632
lvl: 20
188,273
lvl: 17
189,361
lvl: 17
170,046
lvl: 16
143,972
lvl: 14
169,536
lvl: 14
141,491