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Pavlovia error: Cannot read property 'token' of undefined

Some of my participants report this strange error:

[jspsych-pavlovia plugin 2020.5] Error
TypeError: Cannot read property 'token' of undefined

It’s hard for me to debug as I don’t have any variable token in my experiment.
Any ideas what may cause it?

Any chance you found a solution for this? I’m having the same issue, and when it happens, their data csv is downloaded to their computer instead of being sent to the server.