In the wordpress CMS, a thumbnail can be added to a post. You have to add this thumbnail manually to a post, even when the post contains an image.
The 'Automatic Post Thumbnail' plugin automates the addition of thumbnails to posts.
I've created a small bug fix patch, which is part of this plugin since version 3.2.2.
I am Erwin Vrolijk. A technologist, living in Dordrecht, The Netherlands, with a varied talent stack. I help people to be more effective based on data. Learn more about me.