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Two different TypeError(s) in Firefox and Chrome on Pavlovia

URL of the experiment:
speech experiment

URL of the project


Configuration
Windows 10 64-bit, PsychoPy 3.2.4 (I translated Python to JS with PsychoPy 2020.1.3).

Description of the problem:

Dear all,

I am running a recall task in which participants listen to speech sounds and type what they heard. Everything works flawlessly offline. A few problems appeared in Pavlovia.

So far, I managed to progress by trial and error thanks to the forum, but this time I can’t figure out what is wrong with my experiment.

I get the two following errors in two different browsers:

  1. On Firefox, I get:

TypeError: right-hand side of ‘in’ should be an object, got undefined

With regard to TypeError, I read several posts like the following, in which users were suggested to check if there are any empty columns in the conditions files.

https://discourse.psychopy.org/t/online-experiment-issue-typeerror-message/7709/2

I checked many times if all my columns had a header and content, it seems that my excels are right.

  1. On Chrome, I get:

TypeError: Cannot use ‘in’ operator to search for ‘backspace’ in undefined

Does anyone have an idea of what’s going wrong here?

Any hint would be very much appreciated,

Thank you in advance,
Dan