error: "Object of class stdClass could not be converted to string"

After clicking "edit" and then "save" on an image, I get this:

I have no manual links or search keywords added to this image.

The Image has been updated.

    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.
    * : Object of class stdClass could not be converted to string in /home/davidgra/public_html/sites/all/modules/relatedlinks/relatedlinks.module on line 1093.