Elementor - PHP Fatal Error: Call to a Member Function get_main_id() on Null

Overview of the issue

When saving translated Elementor pages that include a Form widget or similar widgets (like the Search widget) in the Advanced Translation Editor (ATE), a fatal error may occur, and the post is not saved. This happens specifically when Elementor's Nested Elements feature is enabled.

PHP Fatal error:  Uncaught Error: Call to a member function get_main_id() on null in /plugins/elementor-pro/core/utils.php:80

Workaround

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

• Open …/wp-content/plugins/elementor-pro/core/utils.php file.
• Look for line 80.
• Replace:

  if ( isset( Plugin::elementor()->documents )  ) {
  

• With:

  if ( isset( Plugin::elementor()->documents ) && Plugin::elementor()->documents->get_current() ) {