Fatal Error showing on 2.16.7 update

Since the last update, getting fatal errors on individual sermon pages.

Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /wp-content/plugins/sermon-manager-for-wordpress/views/partials/content-sermon-single.php:109 Stack trace: #0

/wp-includes/template.php(732): require() #1

/wp-content/plugins/sermon-manager-for-wordpress/includes/sm-template-functions.php(715): load_template(‘/home/customer/…’, false) #2

/wp-content/plugins/sermon-manager-for-wordpress/includes/sm-template-functions.php(480): wpfc_get_partial(‘content-sermon-…’) #3

/wp-content/plugins/sermon-manager-for-wordpress/views/single-wpfc_sermon.php(21): wpfc_sermon_single_v2() #4

/wp-includes/template-loader.php(106): include(‘/home/customer/…’) #5

/wp-blog-he in /wp-content/plugins/sermon-manager-for-wordpress/views/partials/content-sermon-single.php on line 109