The summoner name or tag is incorrect
dumpstr #drain
SILVER I
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Match History for Patch: 16.10.1
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Champion Stats for Patch: 16.10.1
Champion Mastery
lvl: 28
275,689
lvl: 22
236,278
lvl: 17
160,585
lvl: 16
151,167
lvl: 15
161,315
lvl: 13
114,003
lvl: 12
105,503
lvl: 11
120,847
lvl: 11
100,533
lvl: 10
82,022
lvl: 10
79,039
lvl: 10
101,242