Title: Error 304
Last modified: December 24, 2021

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# Error 304

 *  [cronwerk](https://wordpress.org/support/users/cronwerk/)
 * (@cronwerk)
 * [4 years, 5 months ago](https://wordpress.org/support/topic/error-304-2/)
 * Hi!
 * Just after Rank Math update to version 1.0.79 which includes the new file class-
   slack.php the error appeared in debug.log:
 * “PHP Notice: Trying to get property ‘labels’ of non-object in /var/www/laconite.
   ru/wp-content/plugins/seo-by-rank-math/includes/opengraph/class-slack.php on 
   line 304”
 * My site: [https://laconite.ru/](https://laconite.ru/)
 * Regards.

The topic ‘Error 304’ is closed to new replies.

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 * 0 replies
 * 1 participant
 * Last reply from: [cronwerk](https://wordpress.org/support/users/cronwerk/)
 * Last activity: [4 years, 5 months ago](https://wordpress.org/support/topic/error-304-2/)
 * Status: not resolved