Title: PHP Fatal Error – undefined function
Last modified: September 1, 2016

---

# PHP Fatal Error – undefined function

 *  Resolved [derekpricedotnet](https://wordpress.org/support/users/derekpricedotnet/)
 * (@derekpricedotnet)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-1/)
 * Hi, it looks like the most recent version crashed my development site. Here is
   the message from our error log:
 * [07-Jul-2016 19:44:42 UTC] PHP Fatal error: Call to undefined function um_get_option()
   in ***/wp-content/plugins/um-relational-fields/plugin.php on line 83]
 * Removing the plugin fixed the issue. I reinstalled it and the site went back 
   down instantly. Ultimate Members itself seems to still work fine. Please advise.
 * [https://wordpress.org/plugins/um-relational-fields/](https://wordpress.org/plugins/um-relational-fields/)

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

 *  Plugin Author [PlusPlugins](https://wordpress.org/support/users/plusplugins/)
 * (@plusplugins)
 * [9 years, 9 months ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-1/#post-7556106)
 * Hi,
 * Sorry about the delay. We are checking the issues. We will update you shortly.
 * Thanks
 *  Thread Starter [derekpricedotnet](https://wordpress.org/support/users/derekpricedotnet/)
 * (@derekpricedotnet)
 * [9 years, 9 months ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-1/#post-7556107)
 * Thank you. We removed the plugin completely and added it back a few weeks ago
   and it hasn’t given us trouble since.
 *  Plugin Author [PlusPlugins](https://wordpress.org/support/users/plusplugins/)
 * (@plusplugins)
 * [9 years, 9 months ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-1/#post-7556108)
 * Oh Great!!
 * I am closing this issue.

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

The topic ‘PHP Fatal Error – undefined function’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/um-relational-fields_808281.svg)
 * [UM Relational Fields](https://wordpress.org/plugins/um-relational-fields/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/um-relational-fields/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/um-relational-fields/)
 * [Active Topics](https://wordpress.org/support/plugin/um-relational-fields/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/um-relational-fields/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/um-relational-fields/reviews/)

## Tags

 * [php-error](https://wordpress.org/support/topic-tag/php-error/)
 * [undefined function](https://wordpress.org/support/topic-tag/undefined-function/)

 * 3 replies
 * 2 participants
 * Last reply from: [PlusPlugins](https://wordpress.org/support/users/plusplugins/)
 * Last activity: [9 years, 9 months ago](https://wordpress.org/support/topic/php-fatal-error-undefined-function-1/#post-7556108)
 * Status: resolved