Hi all,
A client of mine also had the error, and after googling I see that there is a change in the way PHP interprets the code from PHP 5.5 onwards.
You can resolve the issue by changing the plugin code. On that line 190 change the code from:
if ( ! empty( $this->get_option( 'description' ) ) ) {
to:
if ($this->get_option( 'description' ) ) {
Essentially this is something the plugin developers should do, but unfortunately we can’t wait for them.
Hopes it works for you too!
Igi