Hi. I realize this is an old post – hopefully you’ve fixed or blown this off by now – but the easy fix for me was to check that the variable is set before referencing it. This involved editing the PHP code for the plug-in, so if you’re uncomfortable with that, stop reading now. But it’s actually a pretty easy fix:
ORIGINAL CODE:
if( $button_fname == 'favicon.png' || $button_fname == 'share_16_16.png' ) {
EDIT
if ( (isset($button_fname)) && ($button_fname == 'favicon.png' || $button_fname == 'share_16_16.png' ) ) {
The idea is
if ( (variable is set) AND ( condition1 OR condition2 ) ) {
…do something
}
The error is occurring bc. PHP is trying to check the value of a variable that does not exist.
Of course the easiest fix is to turn off debug mode in WordPress 😉
