The summoner name or tag is incorrect
simplistically #na1
SILVER III
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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: 70
743,692
lvl: 25
305,144
lvl: 24
272,792
lvl: 19
177,488
lvl: 15
131,967
lvl: 8
59,300
lvl: 6
42,473
lvl: 6
37,940
lvl: 5
30,197
lvl: 5
23,765
lvl: 4
21,418
lvl: 4
20,971