月结为空的时候报错

[srvlibs]

app\Admin\Controllers\MonthSettlementController.php 59行
$form->select('accountant_item_id', "结算期")->options($accountant)->default($accountant->keys()->first())->required();
改为
$form->select('accountant_item_id', "结算期")->options($accountant)->default($accountant->keys()->first() ?? '')->required();