The summoner name or tag is incorrect
lavarball #000
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: 30
305,329
lvl: 12
106,670
lvl: 11
95,851
lvl: 9
70,872
lvl: 9
65,398
lvl: 8
63,825
lvl: 8
53,604
lvl: 7
45,396
lvl: 6
35,313
lvl: 5
31,470
lvl: 5
31,458
lvl: 5
31,215