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TypeError: Cannot read property 'render' of null

URL of experiment: https://run.pavlovia.org/laurelmorris/imt_online_v2/html/?__pilotToken=b6d767d2f8ed5d21a44b0e5886680cb9&__oauthToken=17b5f3a021d71d750ec7475ee210312e7dc168fb250bc610fe2663d6e85a7316

Description of the problem:
The task runs fine on Desktop Mac. When trying to run in pilot mode on Pavlovia in Safari I get a blank screen. In Chrome it flashes an error when I refresh the page: “TypeError: Cannot read property ‘render’ of null”.

Many thanks for your help!
Laurel