Uncaught TypeError: Cannot read property ‘body’ of undefined

Sometimes strange behavior may be caused by a plugin or theme conflict. The fastest way to rule out conflicts is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Sixteen. If this resolves the issue, you have a conflict and should activate one plugin at a time until you locate the conflict. Finally, after all plugins are active, switch to your theme. This will narrow down the conflict to a specific plugin or theme.

If you are unfamiliar with checking for conflicts, we wrote a small guide that will walk you through the steps. You can find it here: How To Check For Plugin Conflicts

Not really. Disabling everything and re-enabling one by one doesn’t specify whether the issue exists when only Yoast SEO is active. Does the issue occur when using a default theme with only Yoast SEO active?

Additionally, we have three reports (listed below) of this error but have not received enough information for us to replicate the issue.

https://github.com/Yoast/wordpress-seo/issues/5761
https://github.com/Yoast/wordpress-seo/issues/5742
https://github.com/Yoast/wordpress-seo/issues/5640 (closed for lack of feedback)

Thank you for following up. Can you please add that information to one of the open issue reports listed above? Please include as much information as possible so our development team can reproduce the issue in a test environment. If you have not submitted an issue previously, this guide will help you submit a complete report which may result in a faster resolution.

As the issue is a conflict with another plugin or theme, we highly recommend reporting the issue to the development or support team of the other plugin or theme. Having both teams work on the issue is a benefit to you.

Note: As the issue has been reported to our development team, this topic will be marked as resolved. Additional information should be added to the GitHub issue. Thanks!