Use blog header as default

Hi all,

In Pinegrow Wordpress, you can use “The Post Thumbnail” to set an image to the Featured Image of that post.

But sometimes a user forgets to set a Featured Image and then it shows the famous missing icon for that image.

To prevent this, I thougth I could check the “use blog header image as default image” and then, somewhere in my theme, add “Header image url” to set this default image.

But that doesn’t seem to work. The results for a missing image in html-code are: src(unknown).

Does anyone know how to fix this?

kind regards,