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Fix nullable type declaration #1245

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Fix nullable type declaration #1245

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4 changes: 2 additions & 2 deletions classes/Visualizer/Module/Chart.php
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Original file line number Diff line number Diff line change
Expand Up @@ -375,11 +375,11 @@ public function getCharts() {
*
* @access private
*
* @param WP_Post $chart The chart object.
* @param WP_Post|null $chart The chart object.
*
* @return array The array of chart data.
*/
private function _getChartArray( WP_Post $chart = null ) {
private function _getChartArray( ?WP_Post $chart = null ) {
if ( is_null( $chart ) ) {
$chart = $this->_chart;
}
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