chart widget with page filter $dataChecksum must not be accessed before initialization

Typed property Filament\Widgets\ChartWidget::$dataChecksum must not be accessed before initialization {"userId":1,"exception":"[object] (Error(code: 0): Typed property Filament\\Widgets\\ChartWidget::$dataChecksum must not be accessed before initialization at vendor\\filament\\widgets\\src\\ChartWidget.php:104)