Rise xAPI course errors out without registration context

We have a Rise course published for xAPI.  We're hosting this on an internally developed system that currently points to Scorm Cloud as the LRS.  If we start the course without including a registration={uuid} in the URL, it starts to load but then errors out with "TypeError: Cannot read property 'focus' of null
at main.bundle.js:228" in the console.  Interestingly, it still sends the correct statements to Scorm Cloud...it just doesn't show the course.  As far as I know, the registration context is optional in the xAPI spec...but I'm definitely not an expert.  Anyway, we can work around this, but I thought I'd post it in case it helps someone else.

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