The summoner name or tag is incorrect
sample #boi
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: 9
69,384
lvl: 5
30,974
lvl: 4
17,230
lvl: 4
13,401
lvl: 3
8,334
lvl: 3
7,820
lvl: 3
12,362
lvl: 3
11,829
lvl: 3
10,458
lvl: 3
10,164
lvl: 3
10,048
lvl: 2
5,688