Mysterious Error: ctl.className.indexOf is not a function
The Error
I saw this error in the logs of a XM 10.2.1 Sitecore instance:
Uncaught TypeError: ctl.className.indexOf is not a function | SessionId-RequestId: xxxxxxx-xxxxxxx | PageUrl: https://cm.acme.com/sitecore/shell/Applications/Content Editor.aspx?sc_bw=1 | UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36
The Source
The source of the error turned out to be the Sitecore Extensions Chrome extension:
This is a great tool (thanks Allan NULL)!
The Fix and a Reminder
An older version of the extension was installed, somehow leading to this error. The issue went away after updating the extension.
When you come across issues in Sitecore, it's often a good idea to check the browser extensions.
Extension can be a weakness,
-MG
