Error cannot read properties of undefined (read {assign})

Online experiments
1

Dear all,

I am using the Builder in the 2025 version.
I have an experiment where the participants see a movie and then are shown a sentence that they have to evaluate with a slider.
The movie and the sentence change every trial.

It works fine if I test it on desktop, but I would like to use it online.
When I try to test it in Browser, it correctly shows the movie, but then it crashes and says
Cannot read properties of undefined (read {assign}).

Could you help with that?

Thanks!