[Steven Zahm]

@ walter

Honestly, I have no clue why you would receive that error. I guess you’re lucky. The error doesn’t seem to be affecting functionality. I suspect duplicates are being created because doing a browser refresh.

Open your wp-config.php file and add the following:

error_reporting(0);
@ini_set('display_errors', 0);
@ini_set( 'log_errors', 'On' );

This should be added right before this line:

/* That's all, stop editing! Happy blogging. */

PHP errors and other notices shouldn’t be shown on live sites, they should be written to log file which is what this does. Hope that helps.