The summoner name or tag is incorrect
jitterbug #5678
PLATINUM IV
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Match History for Patch: 16.5.1
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Champion Stats for Patch: 16.5.1
Champion Mastery
lvl: 78
825,612
lvl: 72
767,846
lvl: 59
624,166
lvl: 55
581,596
lvl: 36
394,479
lvl: 28
279,238
lvl: 21
249,875
lvl: 21
203,422
lvl: 13
139,612
lvl: 11
91,858
lvl: 11
113,783
lvl: 10
91,235