@since 2.0.0
	 * @access public
	 *
	 * @param int $user_id Optional. User ID. Default value is `0`.
	 *
	 * @return bool|int
	 */
	public function get_autosave_id( $user_id = 0 ) {
		if ( ! $user_id ) {
			$user_id = get_current_user_id();
		}

		$autosave = Utils::get_post_autosave( $this->post->ID, $user_id );
		if ( $autosave ) {
			return $autosave->ID;
		}

		return false;
	}

	public function save_version() {
		if ( ! defined( 'IS_ELEMENTOR_UPGRADE' ) ) {
			// Save per revision.
			$this->update_meta( '_elementor_version', ELEMENTOR_VERSION );

			/**
			 * Document version save.
			 *
			 * Fires when document version is saved on Elementor.
			 * Will not fire during Elementor Upgrade.
			 *
			 * @since 2.5.12
			 *
			 * @param \Elementor\Core\Base\Document $this The current document.
			 *
			 */
			do_action( 'elementor/document/save_version', $this );
		}
	}

	/**
	 * @since 2.3.0
	 * @access public
	 */
	public function save_template_type() {
		return $this->update_main_meta( self::TYPE_META_KEY, $this->get_name() );
	}

	/**
	 * @since 2.3.0
	 * @access public
	 */
	public function get_template_type() {
		return $this->get_main_meta( self::TYPE_META_KEY );
	}

	/**
	 * @since 2.0.0
	 * @access public
	 *
	 * @param string $key Meta data key.
	 *
	 * @return mixed
	 */
	public function get_main_meta( $key ) {
		return get_post_meta( $this->get_main_id(), $key, true );
	}

	/**
	 * @since 2.0.4
	 * @access public
	 *
	 * @param string $key   Meta data key.
	 * @param string $value Meta data value.
	 *
	 * @return bool|int
	 */
	public function update_main_meta( $key, $value ) {
		return update_post_meta( $this->get_main_id(), $key, $value );
	}

	/**
	 * @since 2.0.4
	 * @access public
	 *
	 * @param string $key   Meta data key.
	 * @param string $value Optional. Meta data value. Default is an empty string.
	 *
	 * @return bool
	 */
	public function delete_main_meta( $key, $value = '' ) {
		return delete_post_meta( $this->get_main_id(), $key, $value );
	}

	/**
	 * @since 2.0.0
	 * @access public
	 *
	 * @param string $key Meta data key.
	 *
	 * @return mixed
	 */
	public function get_meta( $key ) {
		return get_post_meta( $this->post->ID, $key, true );
	}

	/**
	 * @since 2.0.0
	 * @access public
	 *
	 * @param string $key   Meta data key.
	 * @param mixed  $value Meta data value.
	 *
	 * @return bool|int
	 */
	public function update_meta( $key, $value ) {
		// Use `update_metadata` in order to work also with revisions.
		return update_metadata( 'post', $this->post->ID, $key, $value );
	}

	/**
	 * @since 2.0.3
	 * @access public
	 *
	 * @param string $key   Meta data key.
	 * @param string $value Meta data value.
	 *
	 * @return bool
	 */
	public function delete_meta( $key, $value = '' ) {
		// Use `delete_metadata` in order to work also with revisions.
		return delete_metadata( 'post', $this->post->ID, $key, $value );
	}

	/**
	 * @since 2.0.0
	 * @access public
	 */
	public function get_last_edited() {
		$post = $this->post;
		$autosave_post = $this->get_autosave();

		if ( $autosave_post ) {
			$post = $autosave_post->get_post();
		}

		$date = date_i18n( _x( 'M j, H:i', 'revision date format', 'elementor' ), strtotime( $post->post_modified ) );
		$display_name = get_the_author_meta( 'display_name', $post->post_author );

		if ( $autosave_post || 'revision' === $post->post_type ) {
			$last_edited = sprintf(
				/* translators: 1: Saving date, 2: Author display name. */
				esc_html__( 'Draft saved on %1$s by %2$s', 'elementor' ),
				'<time>' . $date . '</time>',
				$display_name
			);
		} else {
			$last_edited = sprintf(
				/* translators: 1: Editing date, 2: Author display name. */
				esc_html__( 'Last edited on %1$s by %2$s', 'elementor' ),
				'<time>' . $date . '</time>',
				$display_name
			);
		}

		return $last_edited;
	}


	/**
	 * @return bool
	 */
	public function is_saving() {
		return $this->is_saving;
	}

	/**
	 * @param $is_saving
	 *
	 * @return $this
	 */
	public function set_is_saving( $is_saving ) {
		$this->is_saving = $is_saving;

		return $this;
	}

	/**
	 * @since 2.0.0
	 * @access public
	 *
	 * @param array $data
	 *
	 * @throws \Exception If the post does not exist.
	 */
	public function __construct( array $data = [] ) {
		if ( $data ) {
			if ( empty( $data['post_id'] ) ) {
				$this->post = new \WP_Post( (object) [] );
			} else {
				$this->post = get_post( $data['post_id'] );

				if ( ! $this->post ) {
					throw new \Exception( sprintf( 'Post ID #%s does not exist.', $data['post_id'] ), Exceptions::NOT_FOUND );
				}
			}

			// Each Control_Stack is based on a unique ID.
			$data['id'] = $data['post_id'];

			if ( ! isset( $data['settings'] ) ) {
				$data['settings'] = [];
			}

			$saved_settings = get_post_meta( $this->post->ID, '_elementor_page_settings', true );
			if ( ! empty( $saved_settings ) && is_array( $saved_settings ) ) {
				$data['settings'] += $saved_settings;
			}
		}

		parent::__construct( $data );
	}

	/*
	 * Get Export Data
	 *
	 * Filters a document's data on export
	 *
	 * @since 3.2.0
	 * @access public
	 *
	 * @return array The data to export
	 */
	public function get_export_data() {
		$content = Plugin::$instance->db->iterate_data( $this->get_elements_data(), function( $element_data ) {
			$element_data['id'] = Utils::generate_random_string();

			$element = Plugin::$instance->elements_manager->create_element_instance( $element_data );

			// If the widget/element does not exist, like a plugin that creates a widget but deactivated.
			if ( ! $element ) {
				return null;
			}

			return $this->process_element_import_export( $element, 'on_export' );
		} );

		return [
			'content' => $content,
			'settings' => $this->get_data( 'settings' ),
			'metadata' => $this->get_export_metadata(),
		];
	}

	public function get_export_summary() {
		return [
			'title' => $this->post->post_title,
			'doc_type' => $this->get_name(),
			'thumbnail' => get_the_post_thumbnail_url( $this->post ),
		];
	}

	/*
	 * Get Import Data
	 *
	 * Filters a document's data on import
	 *
	 * @since 3.2.0
	 * @access public
	 *
	 * @return array The data to import
	 */
	public function get_import_data( array $data ) {
		$data['content'] = Plugin::$instance->db->iterate_data( $data['content'], function( $element_data ) {
			$element = Plugin::$instance->elements_manager->create_element_instance( $element_data );

			// If the widget/element isn't exist, like a plugin that creates a widget but deactivated
			if ( ! $element ) {
				return null;
			}

			return $this->process_element_import_export( $element, 'on_import' );
		} );

		if ( ! empty( $data['settings'] ) ) {
			$template_model = new Page_Model( [
				'id' => 0,
				'settings' => $data['settings'],
			] );

			$page_data = $this->process_element_import_export( $template_model, 'on_import' );

			$data['settings'] = $page_data['settings'];
		}

		return $data;
	}

	/**
	 * Import
	 *
	 * Allows to import an external data to a document
	 *
	 * @since 3.2.0
	 * @access public
	 *
	 * @param array $data
	 */
	public function import( array $data ) {
		$data = $this->get_import_data( $data );

		$this->save( [
			'elements' => $data['content'],
			'settings' => $data['settings'],
		] );

		if ( $data['import_settings']['thumbnail'] ) {
			$attachment = Plugin::$instance->templates_manager->get_import_images_instance()->import( [ 'url' => $data['import_settings']['thumbnail'] ] );

			set_post_thumbnail( $this->get_main_post(), $attachment['id'] );
		}

		if ( ! empty( $data['metadata'] ) ) {
			foreach ( $data['metadata'] as $key => $value ) {
				$this->update_meta( $key, $value );
			}
		}
	}

	public function process_element_import_export( Controls_Stack $element, $method, $element_data = null ) {
		if ( null === $element_data ) {
			$element_data = $element->get_data();
		}

		if ( method_exists( $element, $method ) ) {
			// TODO: Use the internal element data without parameters.
			$element_data = $element->{$method}( $element_data );
		}

		foreach ( $element->get_controls() as $control ) {
			$control_class = Plugin::$instance->controls_manager->get_control( $control['type'] );

			// If the control isn't exist, like a plugin that creates the control but deactivated.
			if ( ! $control_class ) {
				return $element_data;
			}

			// Do not add default value to the final settings, if there is no value at the
			// data before the methods `on_import` or `on_export` called.
			$has_value = isset( $element_data['settings'][ $control['name'] ] );

			if ( $has_value && method_exists( $control_class, $method ) ) {
				$element_data['settings'][ $control['name'] ] = $control_class->{$method}(
					$element_data['settings'][ $control['name'] ],
					$control
				);
			}

			// On Export, check if the control has an argument 'export' => false.
			if ( 'on_export' === $method && isset( $control['export'] ) && false === $control['export'] ) {
				unset( $element_data['settings'][ $control['name'] ] );
			}
		}

		return $element_data;
	}

	protected function get_export_metadata() {
		$metadata = get_post_meta( $this->get_main_id() );

		foreach ( $metadata as $meta_key => $meta_value ) {
			if ( is_protected_meta( $meta_key, 'post' ) ) {
				unset( $metadata[ $meta_key ] );

				continue;
			}

			$metadata[ $meta_key ] = $meta_value[0];
		}

		return $metadata;
	}

	protected function get_remote_library_config() {
		$config = [
			'type' => 'block',
			'default_route' => 'templates/blocks',
			'category' => $this->get_name(),
			'autoImportSettings' => false,
		];

		return $config;
	}

	/**
	 * @since 2.0.4
	 * @access protected
	 *
	 * @param $settings
	 */
	protected function save_settings( $settings ) {
		$page_settings_manager = SettingsManager::get_settings_managers( 'page' );
		$page_settings_manager->ajax_before_save_settings( $settings, $this->post->ID );
		$page_settings_manager->save_settings( $settings, $this->post->ID );
	}

	/**
	 * @since 2.1.3
	 * @access protected
	 */
	protected function print_elements( $elements_data ) {
		// Collect all data updaters that should be updated on runtime.
		$runtime_elements_iteration_actions = $this->get_runtime_elements_iteration_actions();

		if ( $runtime_elements_iteration_actions ) {
			$this->iterate_elements( $elements_data, $runtime_elements_iteration_actions, 'render' );
		}

		foreach ( $elements_data as $element_data ) {
			$element = Plugin::$instance->elements_manager->create_element_instance( $element_data );

			if ( ! $element ) {
				continue;
			}

			$element->print_element();
		}
	}

	protected function register_document_controls() {
		$this->start_controls_section(
			'document_settings',
			[
				'label' => esc_html__( 'General Settings', 'elementor' ),
				'tab' => Controls_Manager::TAB_SETTINGS,
			]
		);

		$this->add_control(
			'post_title',
			[
				'label' => esc_html__( 'Title', 'elementor' ),
				'type' => Controls_Manager::TEXT,
				'default' => $this->post->post_title,
				'label_block' => true,
			]
		);

		$post_type_object = get_post_type_object( $this->post->post_type );

		$can_publish = $post_type_object && current_user_can( $post_type_object->cap->publish_posts );
		$is_published = self::STATUS_PUBLISH === $this->post->post_status || self::STATUS_PRIVATE === $this->post->post_status;

		if ( $is_published || $can_publish || ! Plugin::$instance->editor->is_edit_mode() ) {

			$statuses = $this->get_post_statuses();
			if ( 'future' === $this->get_main_post()->post_status ) {
				$statuses['future'] = esc_html__( 'Future', 'elementor' );
			}

			$this->add_control(
				'post_status',
				[
					'label' => esc_html__( 'Status', 'elementor' ),
					'type' => Controls_Manager::SELECT,
					'default' => $this->get_main_post()->post_status,
					'options' => $statuses,
				]
			);
		}

		$this->end_controls_section();
	}

	protected function get_post_statuses() {
		return get_post_statuses();
	}

	protected function get_have_a_look_url() {
		return $this->get_permalink();
	}

	public function handle_revisions_changed( $post_has_changed, $last_revision, $post ) {
		// In case default, didn't determine the changes.
		if ( ! $post_has_changed ) {
			$last_revision_id = $last_revision->ID;
			$last_revision_document = Plugin::instance()->documents->get( $last_revision_id );
			$post_document = Plugin::instance()->documents->get( $post->ID );

			$last_revision_settings = $last_revision_document->get_settings();
			$post_settings = $post_document->get_settings();

			// TODO: Its better to add crc32 signature for each revision and then only compare one part of the checksum.
			$post_has_changed = $last_revision_settings !== $post_settings;
		}

		return $post_has_changed;
	}

	private function add_handle_revisions_changed_filter() {
		add_filter( 'wp_save_post_revision_post_has_changed', [ $this, 'handle_revisions_changed' ], 10, 3 );
	}

	private function remove_handle_revisions_changed_filter() {
		remove_filter( 'wp_save_post_revision_post_has_changed', [ $this, 'handle_revisions_changed' ] );
	}

	private function get_runtime_elements_iteration_actions() {
		$runtime_elements_iteration_actions = [];

		$elements_iteration_actions = $this->get_elements_iteration_actions();

		foreach ( $elements_iteration_actions as $elements_iteration_action ) {
			if ( $elements_iteration_action->is_action_needed() ) {
				$runtime_elements_iteration_actions[] = $elements_iteration_action;
			}
		}

		return $runtime_elements_iteration_actions;
	}

	private function iterate_elements( $elements, $elements_iteration_actions, $mode ) {
		$unique_page_elements = [];

		foreach ( $elements_iteration_actions as $elements_iteration_action ) {
			$elements_iteration_action->set_mode( $mode );
		}

		Plugin::$instance->db->iterate_data( $elements, function( array $element_data ) use ( &$unique_page_elements, $elements_iteration_actions ) {
			$element_type = 'widget' === $element_data['elType'] ? $element_data['widgetType'] : $element_data['elType'];

			$element = Plugin::$instance->elements_manager->create_element_instance( $element_data );

			if ( $element ) {
				if ( ! in_array( $element_type, $unique_page_elements, true ) ) {
					$unique_page_elements[] = $element_type;

					foreach ( $elements_iteration_actions as $elements_iteration_action ) {
						$elements_iteration_action->unique_element_action( $element );
					}
				}

				foreach ( $elements_iteration_actions as $elements_iteration_action ) {
					$elements_iteration_action->element_action( $element );
				}
			}

			return $element_data;
		} );

		foreach ( $elements_iteration_actions as $elements_iteration_action ) {
			$elements_iteration_action->after_elements_iteration();
		}
	}

	private function get_elements_iteration_actions() {
		if ( ! $this->elements_iteration_actions ) {
			$this->elements_iteration_actions[] = new Assets_Iteration_Action( $this );
		}

		return $this->elements_iteration_actions;
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'Elementor\Core\Base\Document' not found in /home/sportuga/public_html/wp-content/plugins/elementor/includes/plugin.php:712
Stack trace:
#0 /home/sportuga/public_html/wp-content/plugins/elementor/includes/plugin.php(647): Elementor\Plugin-&gt;init_components()
#1 /home/sportuga/public_html/wp-includes/class-wp-hook.php(324): Elementor\Plugin-&gt;init('')
#2 /home/sportuga/public_html/wp-includes/class-wp-hook.php(348): WP_Hook-&gt;apply_filters(NULL, Array)
#3 /home/sportuga/public_html/wp-includes/plugin.php(517): WP_Hook-&gt;do_action(Array)
#4 /home/sportuga/public_html/wp-settings.php(695): do_action('init')
#5 /home/sportuga/public_html/wp-config.php(102): require_once('/home/sportuga/...')
#6 /home/sportuga/public_html/wp-load.php(50): require_once('/home/sportuga/...')
#7 /home/sportuga/public_html/wp-blog-header.php(13): require_once('/home/sportuga/...')
#8 /home/sportuga/public_html/index.php(17): require('/home/sportuga/...')
#9 {main}
  thrown in <b>/home/sportuga/public_html/wp-content/plugins/elementor/includes/plugin.php</b> on line <b>712</b><br />