Error while onile experiment is completed or quit

URL of the experiment:

Hey everybody! I’ve had quite a few errors and problems while translating from python to javascript. I finally managed to get everything going from start to finish as it should, only to find out this annoyance of an error message when the experiment is complete (or if the user quits during the experiment):
TypeError: psychoJS.experiment.isEntryEmpty is not a function

If you have a clue for why this happens, it would be great to hear!