Recently, WordPress released a new update to their platform (5.5). While it adds several nice features, it also no longer enables a common snippet of code (jQuery-migrate) that several key plugins rely on to function properly. These plugins typically include Classic Editor, WooCommerce, Yoast, and host of others. This includes a great deal of themes, custom or otherwise. Pretty much everyone.
Luckily, the WordPress Team released a plugin to resolve the issue for now known as “Enable JQuery Migrate Helper”.
The GitHub page covers it fairly well:
“With the update to WordPress 5.5, a migration tool known as jquery-migrate will no longer be enabled by default. This may lead to unexpected behaviors in some themes or plugins who run older code. This plugin serves as a temporary solution, enabling the migration script for your site to give your plugin and theme authors some more time to update, and test, their code.”
How to Fix the WordPress 5.5 Update Issue (Short Term)
1 – Start by logging into the back end of your WP website, then navigate to the Dashboard.
2 – Once you’re at the Dashboard, find the Plugins item and hover till you see the Add New option.
3 – Click Add New and then find the search bar and enter “Enable jQuery Migrate Helper” – You will see search results come up as you type. Find the plugin named Enable jQuery Migrate Helper (it will have a teal background image and will say “By The WordPress Team” below the description.
4 – Once you’ve found the correct plugin, click on the button that says “Install Now” on the top right of the plugin box.
5 – The button that said “Install Now” will change to a button that says “Activate.” Press the “Activate” button.
That’s all. The issue should be fixed now. Open a new browser window and navigate to your website. Things should return to normal.
How to Fix the WordPress 5.5 Update Issue (Long Term)
Though you don’t have to do it now, you will want to eventually update your affected themes and plugins at some point in the future. Be patient though. Some authors didn’t know this was a an issue until a few hours ago so it might be a few days before an acutal update for affected plugins are availible. But with the above, you should be fine for now anyways.
Downgrade to 5.4
You could potentially downgrade to an earlier version of WP by using a different plugin, such as WP Downgrade. But only as a last resort.
If you have any questions about updating or resolving this issue, please use our support portal at symplydone.com/support and submit a ticket.