public function maybe_handle() {
		if ( $this->feature_detection->supports_async_process() ) {
			parent::maybe_handle();
		}

		// Don't lock up other requests while processing
		session_write_close();

		if ( $this->is_process_running() ) {
			// Background process already running.
			return;
		}

		if ( $this->is_queue_empty() ) {
			// No data to process.
			return;
		}

		$this->handle();

		return null;
	}