The summoner name or tag is incorrect
SILVER III
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Match History for Patch: 16.4.1
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Champion Stats for Patch: 16.4.1
Champion Mastery
lvl: 25
249,070
lvl: 20
194,899
lvl: 18
168,287
lvl: 14
122,020
lvl: 12
105,631
lvl: 12
103,827
lvl: 10
80,739
lvl: 10
79,244
lvl: 10
76,972
lvl: 9
70,647
lvl: 8
61,742
lvl: 8
58,126