BuddyPress.org

Hello.
I am trying to get a certain user’s xprofile field data.
I found a topic.
https://buddypress.org/support/topic/display-a-value-of-a-particular-custom-profile-field/

So I tried

global $current_user;
$user_id = bp_get_member_user_id();
var_dump($user_id); // <--- false!
$class = xprofile_get_field_data('weight', $user_id );

bp_get_member_user_id() returns false.

At bp-members-template.php Line 708,

	function bp_get_member_user_id() {
		global $members_template;
		$member_id = isset( $members_template->member->id ) ? (int) $members_template->member->id : false;

it uses $members_template global variable.
I dumped it, but it was NULL.

Should I initialize or call any function before calling bp_get_member_user_id() ?

Thanks.