on swap hand items:

    cancel event

    set {_현재아이템} to player's tool

    if {_현재아이템} = wooden sword:

        if player is not on ground:

            if {can_dash} = 0:

            set {can_dash} to "1"

            push the player forwards at speed 0.25

            remove strength from player

            apply potion of strength of tier 1 to player for 1 seconds replacing existing effect

every 1 tick:

    loop all players:

        if player is on ground:

            set {can_dash} to "0"

이렇게 썼는데

There's no player in a periodical event

Line: if player is on ground:

라면서 적용이 안 됩니다 어떻게 해야하나요?