Bug: plugin sending headers twice

What Went Wrong:
Searchng posts, pages, ACF fields, and plugins result in the page failing to load with the following error message:

Notice: Undefined index: account in /var/www/html/wp-content/plugins/brightcove-video-connect/includes/admin/class-bc-admin-settings-page.php on line 20 Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/brightcove-video-connect/includes/admin/class-bc-admin-settings-page.php:20) in /var/www/html/wp-admin/includes/misc.php on line 1196 Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/brightcove-video-connect/includes/admin/class-bc-admin-settings-page.php:20) in /var/www/html/wp-includes/pluggable.php on line 1251 Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/brightcove-video-connect/includes/admin/class-bc-admin-settings-page.php:20) in /var/www/html/wp-includes/pluggable.php on line 1254

What Should Happen:
Searching posts, pages, ACF fields, and plugins should return the dashboard with a list of results.

Versions:
WordPress 5.2.2 PHP 7.2

Workaround:
disable Plugin: Brightcove Video Connect plugin.