Title: WordPress SEO-Warning
Last modified: August 21, 2016

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# WordPress SEO-Warning

 *  [Webcrashpilot](https://wordpress.org/support/users/webcrashpilot/)
 * (@webcrashpilot)
 * [11 years, 10 months ago](https://wordpress.org/support/topic/wordpress-seo-warning/)
 * **Warning: substr() expects parameter 1 to be string, object given in …
    lugins/
   wordpress-seo/frontend/class-frontend.php on line 853
 * I can see this on many websites. Does anybody know whats wrong here?
 * [https://wordpress.org/plugins/wordpress-seo/](https://wordpress.org/plugins/wordpress-seo/)

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Thread Starter [Webcrashpilot](https://wordpress.org/support/users/webcrashpilot/)
 * (@webcrashpilot)
 * [11 years, 10 months ago](https://wordpress.org/support/topic/wordpress-seo-warning/#post-5144739)
 * It seems as if this code is the problem:
 *     ```
       if ( '/' == substr( $canonical, 0, 1 ) ) {
       				$canonical = untrailingslashit( get_site_url() ) .
       ```
   
 *  Thread Starter [Webcrashpilot](https://wordpress.org/support/users/webcrashpilot/)
 * (@webcrashpilot)
 * [11 years, 10 months ago](https://wordpress.org/support/topic/wordpress-seo-warning/#post-5144745)
 * I have removed this code and the problem is solved.
 *  [WebKJGor](https://wordpress.org/support/users/webkjgor/)
 * (@webkjgor)
 * [11 years, 10 months ago](https://wordpress.org/support/topic/wordpress-seo-warning/#post-5144946)
 * I’m getting the same error. Is it safe to remove that code?

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘WordPress SEO-Warning’ is closed to new replies.

 * ![](https://ps.w.org/wordpress-seo/assets/icon-256x256.gif?rev=3419908)
 * [Yoast SEO - Advanced SEO with real-time guidance and built-in AI](https://wordpress.org/plugins/wordpress-seo/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wordpress-seo/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wordpress-seo/)
 * [Active Topics](https://wordpress.org/support/plugin/wordpress-seo/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wordpress-seo/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wordpress-seo/reviews/)

## Tags

 * [warning](https://wordpress.org/support/topic-tag/warning/)

 * 3 replies
 * 2 participants
 * Last reply from: [WebKJGor](https://wordpress.org/support/users/webkjgor/)
 * Last activity: [11 years, 10 months ago](https://wordpress.org/support/topic/wordpress-seo-warning/#post-5144946)
 * Status: not resolved