Undefined offset: 0 error in Coursepress

I just updated Coursepress, and I have never seen this error before. It is showing up at the top of my Courses page: https://bmcacademy.barlowmccarthy.com/course-catalog/ and a few other spots as well. Access is open.

Notice: Undefined offset: 0 in /home2/tonyb03/public_html/barlowmccarthy.com/bmcacademy.barlowmccarthy.com/wp-content/plugins/coursepress/includes/classes/class.marketpress-integration.php on line 901