Persistent Server Error

Getting an error on the backend consistently showing up every few seconds: [STDERR] All-in-One Event Calendar: ob_get_clean(): failed to delete buffer of zlib output compression (1) @ /home/xxxx/xxxxxx/wp-content/plugins/all-in-one-event-calendar/lib/global-functions.php:38 #8

That function is:

function ai1ec_stop() {
    if ( ob_get_level() ) {
        echo ob_get_clean();
    }
}