This is most probably a result of your code (or a plugin you’re using) referring to a position array key, which isn’t defined.
This is what I changed in functions.php. It was do to with adding subnav items, removing subnav items and renaming some of them:
/* BP Add subnavigation on profile */
add_action('bp_setup_nav', 'bp_profile_submenu_profile' );
function bp_profile_submenu_profile() {
global $bp;
if(!is_user_logged_in()) return '';
bp_core_new_subnav_item( array(
'name' => 'Seminar Bookings',
'slug' => 'seminar-bookings',
'parent_url' => $bp->loggedin_user->domain . $bp->bp_nav['profile']['slug'] . '/' ,
'parent_slug' => $bp->bp_nav['profile']['slug'],
'position' => 20,
'screen_function' => 'seminar_bookings'
)
);
}
function seminar_bookings() {
add_action( 'bp_template_content', 'seminar_bookings_screen' );
bp_core_load_template( apply_filters( 'bp_core_template_plugin', 'members/single/plugins' ) );
}
function seminar_bookings_screen() {
locate_template( array( 'buddypress/members/single/profile/seminar-bookings.php' ), true );
}
/* BP Remove unneeded subnav items */
function remove_bp_subnav_items() {
global $bp;
bp_core_remove_subnav_item('profile','change-avatar');
bp_core_remove_subnav_item('profile','change-cover-image');
}
add_action( 'bp_setup_nav', 'remove_bp_subnav_items');
/* BP Rename subnav items */
function rename_bp_subnav_items(){
global $bp;
$bp->bp_options_nav['profile']['edit']['name'] = 'Edit Profile';
$bp->bp_options_nav['profile']['public']['name'] = 'View Profile';
}
add_action('bp_setup_nav', 'rename_bp_subnav_items', 201);
The only time I had mentioned ‘position’ was when setting up a new subnav item.
Position is actually optional so if you wanted to avoid investigating what exactly is going on here you could just remove it altogether
