hs.eventtap.event.newSystemKeyEvent: keeps pressing the keys indefintely

[NightMachinery]

I use this function to press system/media keys:

function systemKey(key, repeatDelay)
    -- REPEAT_FASTER = 10 * 1000
    REPEAT_FASTER = 5

    hs.eventtap.event.newSystemKeyEvent(key, true):post()

    if repeatDelay <= 0 then
        repeatDelay = REPEAT_FASTER
    end
    hs.timer.usleep(repeatDelay)
    hs.eventtap.event.newSystemKeyEvent(key, false):post()
end

However, using systemKey("NEXT") keeps going to the next file indefintely.

[NightMachinery]

Restarting solved my issue.