Debug cannot be enabled from addons extentions

[Egemen Aydin]

OK button doesn't work. Receive error as:

function onLoad() {
    document.getElementById("hedera-prefs-debug").checked = window.arguments[0].inputs.debug;
}

function onOK() {
    window.arguments[0].out = {debug: document.getElementById("hedera-prefs-debug").checked}
    return true;
}