Error – Unable to add new video to gallery

I am attempting to add a new youtube video to an existing video gallery. There are 4 videos in the gallery. I click “Add Videos” and enter the URL of the youtube video on one line. It refreshes the page as if it’s going to add the video, but the video does not appear. I checked the error log, and I get this error for each attempt to add the video. “WordPress database error Column ‘post_excerpt’ cannot be null for query”. I am using the latest version of the plugin. Do you know why this is happening? There are no other errors in the log.

Here is the full error:

[Mon Jan 27 21:29:42.217686 2020] [php7:notice] [pid 9679] WordPress database error Column ‘post_excerpt’ cannot be null for query INSERT INTO wp_posts (post_author, post_date, post_date_gmt, post_content, post_content_filtered, post_title, post_excerpt, post_status, post_type, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_parent, menu_order, post_mime_type, guid) VALUES (1, ‘2020-01-27 16:29:42’, ‘2020-01-27 21:29:42’, ”, ”, ”, NULL, ‘inherit’, ‘attachment’, ‘open’, ‘closed’, ”, ”, ”, ”, ‘2020-01-27 16:29:42’, ‘2020-01-27 21:29:42’, 1904, 1, ”, ”) /* From [mysite.org/wp-content/plugins/maxgalleria/meta/video-add.php?post_id=1904&] in [/nas/content/live/mysite/wp-content/plugins/maxgalleria/meta/video-add.php:234] */ made by wp_insert_attachment, wp_insert_post, referer: https://mysite.org/wp-content/plugins/maxgalleria/meta/video-add.php?post_id=1904&