Title: Uncaught TypeError
Last modified: April 5, 2023

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# Uncaught TypeError

 *  Resolved [ninjaray](https://wordpress.org/support/users/ninjaray/)
 * (@ninjaray)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/uncaught-typeerror-70/)
 * Over the past few months, when editing posts in admin, console throws about a
   hundred of these errors in red:
 * Uncaught TypeError: Cannot read properties of undefined (reading ‘InnerBlocks’)
 * And about 30 of these in yellow:
 * jquery.min.js?ver=3.6.1:2 jQuery.Deferred exception: Cannot read properties of
   undefined (reading ‘InnerBlocks’) TypeError: Cannot read properties of undefined(
   reading ‘InnerBlocks’)
 * When “Classic Editor” is not active, we don’t see any errors in Console/F12. 
   Wondering if there is anything we might be able to try to resolve. Our team really
   likes Classic Editor but this is really slowing down the editing of all posts.
   Thank you!
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Funcaught-typeerror-70%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Moderator [Kathryn Presner](https://wordpress.org/support/users/zoonini/)
 * (@zoonini)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/uncaught-typeerror-70/#post-16629754)
 * Hi [@ninjaray](https://wordpress.org/support/users/ninjaray/) – here are the 
   troubleshooting steps I’d recommend:
    - Is the issue present with all your plugins temporarily deactivated, except
      Classic Editor? You can use the [Health Check plugin](https://wordpress.org/plugins/health-check/)‘
      s troubleshooting mode for this, which will not change your live site. If 
      the problem goes away, reactivate your plugins one by one (while still in 
      troubleshooting mode) to find the culprit.
    - Is the issue present with a classic default theme like Twenty Twenty-One? 
      Again, you can use the Health Check plugin for this.
 *  Thread Starter [ninjaray](https://wordpress.org/support/users/ninjaray/)
 * (@ninjaray)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/uncaught-typeerror-70/#post-16658697)
 * Thanks for the troubleshooting steps. The issue is only present with Yoast SEO
   active. No other themes and plugins caused any trouble. This being the case, 
   is there anything that can be done to address it or is my only option to reach
   out to Yoast SEO for assistance? In other words, how to tell if Yoast is breaking
   Classic Editor or is Classic Editor breaking Yoast? 🙂 Any thoughts would be 
   appreciated.
 *  Moderator [Kathryn Presner](https://wordpress.org/support/users/zoonini/)
 * (@zoonini)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/uncaught-typeerror-70/#post-16671800)
 * Hi [@ninjaray](https://wordpress.org/support/users/ninjaray/) – since the Classic
   Editor has not changed its functionality for many years – it hasn’t been developed
   since 2019, when the block editor was introduced – I would guess that it’s probably
   Yoast SEO that would need to tweak something on their end. It’s likely that they
   no longer test their plugin against the classic editor, instead focussing on 
   compatibility with WordPress core (i.e. block editor) functionality.

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

The topic ‘Uncaught TypeError’ is closed to new replies.

 * ![](https://ps.w.org/classic-editor/assets/icon-256x256.png?rev=1998671)
 * [Classic Editor](https://wordpress.org/plugins/classic-editor/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/classic-editor/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/classic-editor/)
 * [Active Topics](https://wordpress.org/support/plugin/classic-editor/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/classic-editor/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/classic-editor/reviews/)

## Tags

 * [classic editor](https://wordpress.org/support/topic-tag/classic-editor/)
 * [InnerBlocks](https://wordpress.org/support/topic-tag/innerblocks/)
 * [uncaught TypeError](https://wordpress.org/support/topic-tag/uncaught-typeerror/)

 * 3 replies
 * 2 participants
 * Last reply from: [Kathryn Presner](https://wordpress.org/support/users/zoonini/)
 * Last activity: [3 years, 1 month ago](https://wordpress.org/support/topic/uncaught-typeerror-70/#post-16671800)
 * Status: resolved