Conflict /w CiviCRM

Originally posted (and answered) here:
http://civicrm.stackexchange.com/questions/2362/did-you-know-wordpress-plugin-seo-ultimates-open-graph-integrator-causes-a-wa/2443?iemail=1&noredirect=1#2443

If you are using CiviCRM in wordpress, and have the “SEO Ultimate” plugin, and its “Open Graph Integrator” module enabled, you may see the following error:

Warning: Missing argument 2 for CiviCRM_For_WordPress::single_page_title() in /home/civicthe/public_html/wp-content/plugins/civicrm/civicrm.php on line 1273

I’m not sure if this causes problems in the backend, but I’m hoping its the cause of some of mine.

Fix: Disable the “Open Graph Integrator” module Install the similar “WordPress SEO by Yoast” plugin instead – it’s open graph module does the same functionality but WITHOUT the error.

ANSWER:
This is a bug in the SEO Ultimate plugin. You should report that they are incorrectly calling:

apply_filters( ‘single_post_title’, $post->post_title )

in three places:

modules/opengraph/opengraph.php (line 116)
modules/titles/titles.php (line 179)
modules/titles/titles.php (line 184)

The call should read:

apply_filters( ‘single_post_title’, $post->post_title, $post ).

https://wordpress.org/plugins/seo-ultimate/