Users>Profile card shortcode trouble

Hi, I’m having trouble with Users>Profile card shortcode. I copied this shortcode to text widget ‘[wpum_profile_card user_id=”” link_to_profile =”yes” display_buttons =”yes” ]’ and the Profile button links to current page, the Mail button links to ‘mailto:’ doesn’t include my email. I am wondering if this is a bug or simply i didn’t use it properly. I left the User ID field empty I thought it would automatically links to the current user. Thanks so much for the awesome plugin.

https://ww.wp.xz.cn/plugins/wp-user-manager/