The summoner name or tag is incorrect
butter #0133
SILVER I
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Match History for Patch: 16.6.1
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Champion Stats for Patch: 16.6.1
Champion Mastery
lvl: 107
1,408,417
lvl: 64
698,215
lvl: 60
674,194
lvl: 35
438,241
lvl: 34
387,548
lvl: 32
385,115
lvl: 18
208,795
lvl: 15
155,996
lvl: 11
98,395
lvl: 11
93,659
lvl: 9
80,866
lvl: 8
74,414