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The new highest JS error on https://studio.code.org according to New Relic, over the past 7 days, is
Error: Cannot read property 'setAttribute' of nullin whichrecthere isnull. It mainly occurred over a 24 hour period which has now ended, but has been seen up to 6 months ago. There is no known repro, but the fix here should prevent more JS errors at least. A similar check forimgbeingnullhas also been added.