The summoner name or tag is incorrect
stellar #5505
PLATINUM IV
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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: 101
1,087,039
lvl: 54
568,082
lvl: 39
423,138
lvl: 22
214,983
lvl: 12
106,779
lvl: 9
98,734
lvl: 8
64,070
lvl: 8
59,792
lvl: 8
57,817
lvl: 8
54,418
lvl: 7
53,453
lvl: 7
46,589