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'Node was not found' error after the experiment finished

Though it’s bit off topic, Pavlovia looks amazing!

I ran the stroop demo using Firefox Quantum 64-bit v62.0, the experiment ran smoothly but I encountered the error afterwards:

After I clicked OK, the page was totally blank.
The same error occurred multiple times. Since the data were saved successfully, I wondered if it is a problem or just a random benign error?

Thanks in advance,