| @@ -576,9 +576,9 @@ | ||
| 576 | 576 | // load assets |
| 577 | 577 | $this->vbo_app->loadDatePicker(); |
| 578 | 578 | } |
| 579 | 579 | |
| 580 | - public function render(VBOMultitaskData $data = null) | |
| 580 | + public function render(?VBOMultitaskData $data = null) | |
| 581 | 581 | { |
| 582 | 582 | // increase widget's instance counter |
| 583 | 583 | static::$instance_counter++; |
| 584 | 584 | |
