Antylog out

Witam mam błąd w skrypcie w ""    if attacker is player: " Co to za błąd ??

on damage:

    if attacker is player:

        if victim is player:

            if {antylogout::%victim%} is not set:

                send "&cJestes podczas walki! Nie logaj!" to victim

            set {antylogout::%victim%} to 20

every 1 seconds:

    loop all players:

        if {antylogout::%loop-player%} is set:

            if {antylogout::%loop-player%} is greater than 0:

                remove 1 from {antylogout::%loop-player%}

                set action bar of loop-player to "&c&lAntyLogout &7&l(&4%{antylogout::%loop-player%}%&8:&4&k99&7&l)"

            else:

                clear {antylogout::%loop-player%}

                send "&aSkonczyles walczyc." to loop-player

                set action bar of loop-player to "&a&lAntyLogout"

on quit:

    if {antylogout::%player%} is set:

        kill player

        broadcast "&cGracz %player% wylogowal sie podczas walki!"

on death:

    clear {antylogout::%victim%}

on command:

    if {antylogout::%player%} is set:

        if command is not "helpop":

            cancel event

            send "&4Uzywanie komend podczas pvp jest niemozliwe. Jedynie /helpop."

on rightclick on ender chest:

    if {antylogout::%player%} is set:

        cancel event

        send "&cPodczas walki nie mozna otwierac enderchesta!"

on place:

    if player's y-coordinate is less than 45:

        if {antylogout::%player%} is set:

            cancel event

            send "&cPodczas walki nie mozna stawiac blokow ponizej 45 poziomu!"