The summoner name or tag is incorrect
fullstringer #na1
BRONZE III
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Match History for Patch: 16.9.1
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Champion Stats for Patch: 16.9.1
Champion Mastery
lvl: 16
154,251
lvl: 14
134,100
lvl: 13
115,173
lvl: 10
108,267
lvl: 9
70,165
lvl: 8
58,280
lvl: 8
57,606
lvl: 8
54,732
lvl: 7
47,889
lvl: 6
33,507
lvl: 6
32,313
lvl: 5
40,223