<?php

/**
 * Set Default About Me Widget Image.
 */
function yzc_set_default_profile_about_me_widget_image( $photo_url ) {

    if ( ! empty( $photo_url ) ) {
        return $photo_url;
    }
    return 'put_here_default_image_link';
}
add_filter( 'yz_profile_about_me_widget_image', 'yzc_set_default_profile_about_me_widget_image' );