Title: Call to undefined function note_widget()
Last modified: August 30, 2016

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# Call to undefined function note_widget()

 *  Resolved [Luis Martins](https://wordpress.org/support/users/lmartins/)
 * (@lmartins)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/)
 * Hi,
 * Since the latest update New Relic is constantly outputting the following errors
   for sites where Im using Note:
 *     ```
       Error message
       E_ERROR: Call to undefined function note_widget()
   
       Stack trace
       …wordpress/wordpress/wp-content/plugins/note/includes/
       class-note-customizer.php (126)
       in Note_Customizer::init called at ? (?)
       …call_user_func_array called at /srv/wordpress/wordpress/wp-includes/
       plugin.php (496)
       in do_action called at /srv/wordpress/wordpress/wp-settings.php (353)
       in require_once called at /srv/wordpress/wordpress/wp-config.php (141)
       in require_once called at /srv/wordpress/wordpress/wp-load.php (37)
       in require_once called at /srv/wordpress/wordpress/wp-blog-header.php (12)
       in require called at /srv/wordpress/wordpress/index.php (17)
       ```
   
 * [https://wordpress.org/plugins/note/](https://wordpress.org/plugins/note/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Author [Slocum Studio](https://wordpress.org/support/users/slocumstudio/)
 * (@slocumstudio)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243752)
 * Hi Luis,
 * Thanks for reporting this error. Unfortunately, we’re not able to reproduce this
   error in our testing.
 * Here’s a bit of technical background as to how this particular portion of Note
   is functioning:
 * We have logic that is setup to run in the Customizer to populate a few areas 
   of Note with configuration data. This logic is run on the `init` action at the
   normal default priority of 10. Our `init` logic should always fire after the `
   widgets_init` action which introduces the `Note_Widget()` helper function and
   registers the Note Widget in WordPress. This is because the `widgets_init` action
   is set to run at priority 1 of the `init` action and since ours is set to the
   default of 10, it should fire after `widgets_init`.
 * That being said, we are noticing that in your report, this helper function appears
   to be lowercase: `note_widget()`. We’re not sure if this is due to New Relic’s
   error reporting, copying and pasting into WordPress support, or if your version
   of Note is trying to call a lowercase version of that function.
 * You can see here in the Note code base that the function call is correct for 
   where the error is being reported in your instance – [https://plugins.trac.wordpress.org/browser/note/trunk/includes/class-note-customizer.php#L126](https://plugins.trac.wordpress.org/browser/note/trunk/includes/class-note-customizer.php#L126).
   We’ve also ensured that our version control repositories contain the correct 
   function call, and they do.
 * I would first suggest re-installing Note to see if this error still persists.
   If it does, would you be able to provide us with more information about your 
   setup such as PHP version, WordPress version, theme, active plugins, etc..?
 * Thank You,
    Scott
 *  Thread Starter [Luis Martins](https://wordpress.org/support/users/lmartins/)
 * (@lmartins)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243807)
 * Sorry, I didn’t got a notification for your reply and only when noticed it today.
   Will confirm your suggestions and report back here.
 *  Thread Starter [Luis Martins](https://wordpress.org/support/users/lmartins/)
 * (@lmartins)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243808)
 * Hello again,
 * I’ve noticed that the pages that are triggering this error are always /sitemap_index.
   xml, which is really weird since they shouldn’t be running code from this widget
   anyway. I’ve checked the plugin source on my install and it does show the correct
   word capitalisation, however the log files show the same problem.
 * Any tips on what might be happening?
 *  Thread Starter [Luis Martins](https://wordpress.org/support/users/lmartins/)
 * (@lmartins)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243809)
 * Ok, we’ve managed to pinpoint the issue.
    This happens when using both the Note
   plugin and Yoast SEO with the sitemaps feature enabled.
 * Yoast runs the following:
 *     ```
       if ( false !== stripos( $request_uri, 'sitemap' ) && ( in_array( $extension, array( '.xml', '.xsl' ) ) ) ) {
                               remove_all_actions( 'widgets_init' );
                       }
       ```
   
 * This removes the Note class and therefore when it tries to run gives a 500 error.
   This only happens when Google tries to read the sitemap files.
 * On your plugin, on the line that says:
 *     ```
       if ( ! class_exists( 'Note_Customizer' ) ) {
       ```
   
 * We’ve changed it to:
 *     ```
       if ( class_exists( 'Note_Widget' ) && ! class_exists( 'Note_Customizer' ) ) {
       ```
   
 * This goes around the problem, not sure if with unforeseen consequences. Maybe
   you could comment on that, if this is the proper way to do it and the fix could
   be included in next updates for Note.
 * Thanks.
 *  Plugin Author [Slocum Studio](https://wordpress.org/support/users/slocumstudio/)
 * (@slocumstudio)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243832)
 * Hi Luis,
 * Thanks for all of your effort to determine the source of this error. We just 
   pushed an update with a fix. We also mentioned your name in the release notes:).
 * We have run into this issue previously in our premium [Conductor plugin](http://conductorplugin.com)
   with Yoast and your fix was close to the one that we decided to implement.
 * In the end, since we only needed to grab our Note Widget id_base, we decided 
   to add a `function_exists( 'Note_Widget' )` call before our `$note_widget` variable
   in the `Note_Customizer` class. We then check if that variable is set and use
   the id_base found in the Note Widget.
 * Let us know if you have any other questions or concerns.
 * Thanks,
    Scott

Viewing 5 replies - 1 through 5 (of 5 total)

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 * 5 replies
 * 2 participants
 * Last reply from: [Slocum Studio](https://wordpress.org/support/users/slocumstudio/)
 * Last activity: [10 years, 11 months ago](https://wordpress.org/support/topic/call-to-undefined-function-note_widget/#post-6243832)
 * Status: resolved