Add a custom tab to Members Directory and load custom template

directory tab error

<?php


// add tab 'Testo' on Members Directory Page
function asdf_testo_tab() {

	if ( ! bp_current_component( 'members' ) )
		return; 
	
	if ( bp_is_current_action( 'testo' ) ) 
		return;

	$button_args = array(
		'id'         => 'testo',
		'component'  => 'members',
		'link_text'  => __( 'Testo', 'bp' ),
		'link_title' => __( 'Testo', 'bp' ),
		'link_class' => 'testo no-ajax',
		'link_href'  => trailingslashit( bp_get_members_directory_permalink() . 'testo' ),
		'wrapper'    => false,
		'block_self' => false,
	);	
	
	?>
	<li><?php echo bp_get_button( apply_filters( 'bp_get_testo_map_button', $button_args ) ); ?></a></li>
	<?php
}
add_action( 'bp_members_directory_member_types', 'asdf_testo_tab' );


// load the custom template
function asdf_testo_show_map() {

	// When clicking on the 'Testo' tab on the Members Directory, bp_is_members_component() will always be false - Why?
	// The equivalent conditionals work properly in Groups	- why?
	// bp_is_groups_component() will always be true in this approach:
	// https://codex.buddypress.org/add-custom-tab-to-groups-directory/
	// What is the reason for the discrepancy ?
	
	if ( bp_is_members_component()  )
		echo 'this is the members component';
	else
		echo 'this is NOT the members component';


	// Because we cannot use the preferred conditionals - instead parse the url
	// This works. The template is loaded. 
	// But this error is thrown:
	// Notice: Trying to get property of non-object in .../wp-includes/query.php on line 4520
	// unless we manually set the current component
	// Why?
	
	$requested_url = bp_get_requested_url();
	
	if( ( strpos( $requested_url, BP_MEMBERS_SLUG ) !== false ) && ( strpos( $requested_url, 'testo' ) !== false ) ) {
	
		// manually set current component to 'members'
		$bp = buddypress(); 
		$bp->current_component = BP_MEMBERS_SLUG;
		
		new BP_Members_Theme_Compat_Testo();
	
		bp_core_load_template( 'members/testo' );	

	}

}
add_action( 'bp_actions', 'asdf_testo_show_map' );


class BP_Members_Theme_Compat_Testo {

	public function __construct() {
		add_action( 'bp_setup_theme_compat', array( $this, 'is_testo' ) );
	}

	public function is_testo() {

		add_action( 'bp_template_include_reset_dummy_post_data', array( $this, 'directory_dummy_post' ) );
		add_filter( 'bp_replace_the_content',                    array( $this, 'directory_content'    ) );

	}

	public function directory_dummy_post() {
		bp_theme_compat_reset_post( array(
			'ID'             => 0,
			'post_title'     => 'Testo',
			'post_author'    => 0,
			'post_date'      => 0,
			'post_content'   => '',
			'post_type'      => 'page',
			'post_status'    => 'publish',
			'is_page'        => true,
			'comment_status' => 'closed'
		) );
	}

	public function directory_content() {
		return bp_buffer_template_part( 'members/testo', null, false );
	}

}