Server 13w24b stop While using /kill command

My Server Stop While Using /kill command idk if it was cuz I was Creative but it does , I was playing with my friends then I forgot the spawn so I use /kill to die and then go back but then the server freeze I was waiting then I try another command using [tab] button to complete the name and then nothing respond then I see the server status th line was down so the server stop and then doenst respond anymore then I reopened it again and use the command /kill and then I know that it was that command