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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?

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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.

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I’m also having this problem, could really use a lead on this, thanks to anyone that’s figured it out!

Is it possible to send your experiment’s link? So I’ll try to get this error and check one thing. I’m not a pro user/coder so I’m not promising to solve your problem %100 but, I can try one or two thing to find the error. Are you saving the incomplete results? If I try to run it more than one time will it cost more than one credit?