Uncaught TypeError: Cannot read property ‘msie’ of undefined when upgrading to WordPress 5.5

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Uncaught TypeError: Cannot read property ‘msie’ of undefined when upgrading to WordPress 5.5

Recently when upgrading an older site to WordPress 5.5 I noticed a javascript error in the console that read Uncaught TypeError: Cannot read property ‘msie’ of undefined.

If you have a plugin or script that relied on an older version of jQuery it will no longer work because WordPress updated their jQuery version. In order to fix add this to the top of your scripts file

 


Written by: Jacob Lett, a website designer & developer who creates HubSpot CMS themes and writes web design & marketing books to help marketers, designers, and web developers grow their businesses. This blog is my own personal journal and source to help others through some challenges I have faced.
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