Crash client on kick

Client crash on kick.
This is the error in the console.
[19:34:16] User Authenticator #8/INFO: UUID of player Ruytaro is fb2f33e0-e3d1-49da-9b3f-1d213c2daec9
[19:34:16] [Server thread/INFO]: Ruytaro[/79.157.239.9:6497] logged in with entity id 163337 at (704.459003212742, 65.81932930938198, 1803.5954170010928)
[19:34:16] [Server thread/INFO]: Ruytaro joined the game
[19:34:20] [Server thread/WARN]: Ruytaro was kicked for floating too long!
[19:34:20] [Server thread/INFO]: Ruytaro lost connection: TextComponent{text='Flying is not enabled on this server', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[19:34:20] [Server thread/INFO]: Ruytaro left the game