What's wrong with a chat command? Why do you even need a summon. Just warp to the player in question. It's just another toy that screams "Abuse me". Also, adding a row to a GUI control is pretty simple stuff and doesn't require a genuis to code it. Why post something like this?
and for this...
PHP Code:
if (graalversion == 6.015 || graalversion > 6.015) {
It can be shortened down to...
PHP Code:
if (graalversion < 6) {