I was playing in a world, then entered this command.
/give @p golden_boots{Enchantments:[{Frost_Walker,lvl:100}]}
Apparently, this crashed the game. I restarted the game, but crashed again.
Environment
Device: MacBook Air 2015
OS: macOS 10.12.5
Snapshot Version: 18w22a
You forgot the
idtag before "Frost_Walker"MC-130169 is most likely your issue, however I cannot reproduce the crash in 18w22a