function bbp_user_maybe_convert_pass() {

	// Sanitize username
	$username = ! empty( $_POST['log'] )
		? sanitize_user( $_POST['log'] )
		: '';

	// Bail if no username
	if ( empty( $username ) ) {
		return;
	}

	// Bail if no user password to convert
	$bbp_db = bbp_db();
	$query  = $bbp_db->prepare( "SELECT * FROM {$bbp_db->users} INNER JOIN {$bbp_db->usermeta} ON user_id = ID WHERE meta_key = %s AND user_login = %s LIMIT 1", '_bbp_class', $username );
	$row    = $bbp_db->get_row( $query );
	if ( empty( $row ) || is_wp_error( $row ) ) {
		return;
	}

	// Setup the converter
	bbp_setup_converter();

	// Try to convert the old password for this user
	$converter = bbp_new_converter( $row->meta_value );

	// Try to call the conversion method
	if ( ( $converter instanceof BBP_Converter_Base ) && method_exists( $converter, 'callback_pass' ) ) {
		$converter->callback_pass( $username, $_POST['pwd'] );
	}
}