after you get "burning the midnight oil rank 2" there is a bug where the skill pauses the cooldown countdown on 1, restarting the page makes the skill available again but the bug is still there
it doesnt stop forever, just the 15 seconds, i think the cooldown only decreases visually but it still waits 15s before the skill is available (it still is a bug, only you dont have to restart the game because of it)
