Media Gallery Block remains after deleting node

I deleted a media gallery node that was currently employed as a media gallery block, and the block remains with "No content available." in the content box. On all pages where this block appears I also get an error:

"Notice: Trying to get property of non-object in media_gallery_block_view() (line 567 of /home/user/public_html/url.com/sample1/sites/all/modules/media_gallery/media_gallery.module)."

Now I can't delete the remaining block because it does not appear in the blocks admin page.

Anyone know how to fix this?

SR