);

		do {
			$batch = $this->get_batch();

			foreach ( $batch->data as $key => $value ) {
				$task = $this->task( $value );

				if ( false !== $task ) {
					$batch->data[ $key ] = $task;
				} else {
					unset( $batch->data[ $key ] );
				}

				if ( $this->batch_limit_exceeded() ) {
					// Batch limits reached.
					break;
				}
			}

			// Update or delete current batch.
			if ( ! empty( $batch->data ) ) {
				$this->update( $batch->key, $batch->data );
			} else {
				$this->delete( $batch->key );
			}
		} while ( ! $this->batch_limit_exceeded() && ! $this->is_queue_empty() );

		$this->unlock_process();

		// Start next batch or complete process.
		if ( ! $this->is_queue_empty() ) {
			$this->dispatch();
		} else {
			$this->complete();
		}
	}

	/**
	 * Use the protected `is_process_running` method as a public method.
	 * @return bool
	 */
	public function is_process_locked() {
		return $this->is_process_running();
	}

	public function handle_immediately( $callbacks ) {
		$this->manager->on_runner_start();

		$this->lock_process();

		foreach ( $callbacks as $callback ) {
			$item = [
				'callback' => $callback,
			];

			do {
				$item = $this->task( $item );
			} while ( $item );
		}

		$this->unlock_process();
	}

	/**
	 * Task
	 *
	 * Override this method to perform any actions required on each
	 * queue item. Return the modified item for further processing
	 * in the next pass through. Or, return false to remove the
	 * item from the queue.
	 *
	 * @param array $item
	 *
	 * @return array|bool
	 */
	protected function task( $item ) {
		$result = false;

		if ( ! isset( $item['iterate_num'] ) ) {
			$item['iterate_num'] = 1;
		}

		$logger = Plugin::$instance->logger->get_logger();
		$callback = $this->format_callback_log( $item );

		if ( is_callable( $item['callback'] ) ) {
			$progress = '';

			if ( 1 < $item['iterate_num'] ) {
				if ( empty( $item['total'] ) ) {
					$progress = sprintf( '(x%s)', $item['iterate_num'] );
				} else {
					$percent = ceil( $item['iterate_num'] / ( $item['total'] / 100 ) );
					$progress = sprintf( '(%s of %s, %s%%)', $item['iterate_num'], $item['total'], $percent );
				}
			}

			$logger->info( sprintf( '%s Start %s', $callback, $progress ) );

			$this->current_item = $item;

			$result = (bool) call_user_func( $item['callback'], $this );

			// get back the updated item.
			$item = $this->current_item;
			$this->current_item = null;

			if ( $result ) {
				if ( empty( $item['total'] ) ) {
					$logger->info( sprintf( '%s callback needs to run again', $callback ) );
				} elseif ( 1 === $item['iterate_num'] ) {
					$logger->info( sprintf( '%s callback needs to run more %d times', $callback, $item['total'] - $item['iterate_num'] ) );
				}

				$item['iterate_num']++;
			} else {
				$logger->info( sprintf( '%s Finished', $callback ) );
			}
		} else {
			$logger->notice( sprintf( 'Could not find %s callback', $callback ) );
		}

		return $result ? $item : false;
	}

	/**
	 * Schedule cron healthcheck.
	 *
	 * @param array $schedules Schedules.
	 * @return array
	 */
	public function schedule_cron_healthcheck( $schedules ) {
		$interval = apply_filters( $this->identifier . '_cron_interval', 5 );

		// Adds every 5 minutes to the existing schedules.
		$schedules[ $this->identifier . '_cron_interval' ] = array(
			'interval' => MINUTE_IN_SECONDS * $interval,
			'display' => sprintf(
				/* translators: %d: Interval in minutes. */
				esc_html__( 'Every %d minutes', 'elementor' ),
				$interval
			),
		);

		return $schedules;
	}

	/**
	 * See if the batch limit has been exceeded.
	 *
	 * @return bool
	 */
	public function is_memory_exceeded() {
		return $this->memory_exceeded();
	}

	/**
	 * Delete all batches.
	 *
	 * @return self
	 */
	public function delete_all_batches() {
		global $wpdb;

		$table = $wpdb->options;
		$column = 'option_name';

		if ( is_multisite() ) {
			$table = $wpdb->sitemeta;
			$column = 'meta_key';
		}

		$key = $wpdb->esc_like( $this->identifier . '_batch_' ) . '%';

		$wpdb->query( $wpdb->prepare( "DELETE FROM {$table} WHERE {$column} LIKE %s", $key ) ); // @codingStandardsIgnoreLine.

		return $this;
	}

	/**
	 * Kill process.
	 *
	 * Stop processing queue items, clear cronjob and delete all batches.
	 */
	public function kill_process() {
		if ( ! $this->is_queue_empty() ) {
			$this->delete_all_batches();
			wp_clear_scheduled_hook( $this->cron_hook_identifier );
		}
	}

	public function set_current_item( $item ) {
		$this->current_item = $item;
	}

	protected function format_callback_log( $item ) {
		return implode( '::', (array) $item['callback'] );
	}

	/**
	 * @var \Elementor\Core\Base\Background_Task_Manager
	 */
	protected $manager;

	public function __construct( $manager ) {
		$this->manager = $manager;
		// Uses unique prefix per blog so each blog has separate queue.
		$this->prefix = 'elementor_' . get_current_blog_id();
		$this->action = $this->manager->get_action();

		parent::__construct();
	}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'Elementor\Core\Base\Background_Task' not found in /home/sportuga/public_html/wp-content/plugins/elementor/core/upgrade/task.php:12
Stack trace:
#0 /home/sportuga/public_html/wp-content/plugins/elementor/includes/autoloader.php(294): require()
#1 /home/sportuga/public_html/wp-content/plugins/elementor/includes/autoloader.php(330): Elementor\Autoloader::load_class('Core\\Upgrade\\Ta...')
#2 [internal function]: Elementor\Autoloader::autoload('Elementor\\Core\\...')
#3 /home/sportuga/public_html/wp-content/plugins/elementor/core/base/background-task-manager.php(39): spl_autoload_call('Elementor\\Core\\...')
#4 /home/sportuga/public_html/wp-content/plugins/elementor/core/upgrade/custom-tasks-manager.php(103): Elementor\Core\Base\Background_Task_Manager-&gt;get_task_runner()
#5 /home/sportuga/public_html/wp-content/plugins/elementor/includes/plugin.php(748): Elementor\Core\Upgrade\Custom_Tasks_Manager-&gt;__construct()
#6 /home/sportuga/public_html/wp-content/plugins/elementor/includes/plugin.php( in <b>/home/sportuga/public_html/wp-content/plugins/elementor/core/upgrade/task.php</b> on line <b>12</b><br />