Added conditions callback not invoked

Added filter and condition for ‘Is NOT logged in’ – complement to the Is logged in provided – want to display specific menu items including to a login page.

Code added:

add_filter( 'if_menu_conditions', 'gmcdesign_if_menu_conditions' );

function gmcdesign_if_menu_conditions( $conditions ) {
gmcdesign_debug_log('gmcdesign_if_menu_conditions invoked');
gmcdesign_debug_log($conditions);
  $conditions[] = array(
      'id'        =>  'is-not-logged-in',
      'name'      =>  'Is NOT logged in',                                       // name of the condition
      'condition' =>  'gmcdesign_is_user_not_logged_in',                        // callback - must return TRUE or FALSE
//      'condition' =>  function() {                                              // callback - must return TRUE or FALSE
//                        if (is_user_logged_in()) return FALSE;
//                        return TRUE;
//                      }
  );
gmcdesign_debug_log($conditions);
  return $conditions;
}

function gmcdesign_is_user_not_logged_in() {
gmcdesign_debug_log('gmcdesign_is_user_not_logged_in invoked');
  if (is_user_logged_in()) return FALSE;
  return TRUE;
}

Requested menu item doesn’t appear.. (A ‘Login’ submenu uner the ‘Membership’ tab)

Note from Debug log below:
– shows entry to the add_filter defined function
– EMPTY $conditions passed to filter function
– Populated $conditions on return from filter function
– callback function for new addition never called
– undefined index in /plugins/if-menu/if-menu.php on line 110

[24-Feb-2021 17:13:12 UTC] gmcdesign_if_menu_conditions invoked
[24-Feb-2021 17:13:12 UTC] Array
(
)

[24-Feb-2021 17:13:12 UTC] Array
(
[0] => Array
(
[id] => is-not-logged-in
[name] => Is NOT logged in
[condition] => gmcdesign_is_user_not_logged_in
)

)

[24-Feb-2021 17:13:12 UTC] PHP Notice: Undefined index: in /home/michiganwood/www/staging2/wp-content/plugins/if-menu/if-menu.php on line 110
[24-Feb-2021 17:13:12 UTC] PHP Notice: Trying to access array offset on value of type null in /home/michiganwood/www/staging2/wp-content/plugins/if-menu/if-menu.php on line 110
[24-Feb-2021 17:13:12 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /home/michiganwood/www/staging2/wp-content/plugins/if-menu/if-menu.php on line 110

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