| @@ -519,13 +519,13 @@ | ||
| 519 | 519 | /** |
| 520 | 520 | * Main method to invoke the widget. Contents will be loaded |
| 521 | 521 | * through AJAX requests, not via PHP when the page loads. |
| 522 | 522 | * |
| 523 | - * @param VBOMultitaskData $data multitask data object. | |
| 523 | + * @param ?VBOMultitaskData $data multitask data object. | |
| 524 | 524 | * |
| 525 | 525 | * @return void |
| 526 | 526 | */ |
| 527 | - public function render(VBOMultitaskData $data = null) | |
| 527 | + public function render(?VBOMultitaskData $data = null) | |
| 528 | 528 | { |
| 529 | 529 | // increase widget's instance counter |
| 530 | 530 | static::$instance_counter++; |
| 531 | 531 | |
