Astra Theme - Warning: Undefined property: stdClass::$menu_id...

Overview of the issue

When using the Astra theme with WPML, PHP warnings related to undefined properties (menu_id) are displayed in the WPML > Languages section. These warnings appear when a main menu is assigned, and WPML’s “Menu Language Switcher” is enabled.

Warning: Undefined property: stdClass::$menu_id in .../wp-content/themes/astra/inc/extras.php on line 513
Warning: Undefined property: stdClass::$menu_id in .../wp-content/themes/astra/inc/extras.php on line 546

Workaround

Please, make sure of having a full site backup of your site before proceeding.

• Open …/wp-content/themes/astra/inc/extras.php file.
• Look for line 513.
• Replace:

  		if ( in_array( $args->menu_id, $astra_menu_locations ) ) {
  

• With:

  		if ( isset( $args->menu_id ) && in_array( $args->menu_id, $astra_menu_locations ) ) {
  

• In the same file, move to line 546.
• Replace:

  	$is_special_menu = in_array( $args->menu_id, $special_menu_ids );
  

• With:

  	if ( isset( $args->menu_id ) && in_array( $args->menu_id, $astra_menu_locations ) ) {