[Steven Zahm]

re: Douglas

No, this is not fatal and Link works just fine. Right in the error it says it is a notice. The WP_DEBUG is set to false by default, but as explained in the blog post I shared the link to states… “However, the problem is that sometimes the above does not work. That can happen most times on shared hosts that force displaying PHP warnings and notices.”

The post then goes on to supply the instructions on what to add to the wp-config.php file settings that should force the removal of PHP notices.

Like I said, it is best practice on a production server to have these notices suppressed.