on place:
    if {block::%location of event-block%} is set:
        if {block::%location of event-block%} is name of player:
            stop
        else:
            cancel event
            send "&6Nie mozesz stawiac niczego w miejscu nalezacym do gracza %{block::%location of event-block%}%"
            stop
    else:
        set {block::%location of event-block%} to name of player
        stop

on break:
    if {block::%location of event-block%} is set:
        if {block::%location of event-block%} is name of player:
            delete {block::%location of event-block%}
            stop
        else:
            cancel event
            send "&6Nie mozesz zniszczyc bloku nalezacego do gracza %{block::%location of event-block%}%"
            stop