This is because of the new PHP version, to fix this issue you can use the following function code. Please see the steps below:

Note: Make sure to have a complete site backup before proceeding

1. Go to Appearance > Theme Editor.

2. Under Select theme to edit, choose (BuddyBoss Child/whatever theme is active), then click Select.

3. Below Theme Files, select Theme Functions (functions.php).

4. Append the code just before the closing PHP tag “?>”:

add_filter( 'get_user_option_sap_user_bookmarks', 'return_empty_array_if_no_posts_found', 10, 3 );
function return_empty_array_if_no_posts_found( $result, $option, $user ){
  
  if( ! $result ) {
    return array();
  }
  
  return $result;
}

5. Click Update File to save the changes.

Note: Any modifications are considered as custom work already. Know more about our Support Policy here: https://www.buddyboss.com/support-policy/