我有一个带有react 式表单数组项的模板:
<li class="nav-main-item" formArrayName="closedStatuses" *ngFor="let item of statusesForm.get('closedStatuses')['controls']; let i = index">
<a formGroupName="{{i}}" class="nav-main-link" href="javascript:void(0)">
<span class="nav-main-link-name">
<div class="form-check">
<input class="form-check-input"
type="checkbox"
[attr.id]="'closed-' + i"
[attr.name]="'closed-' + i"
formControlName="checked"
(change)="onSelectStatus()">
<label class="form-check-label" [attr.for]="'closed-' + i">{{ item.controls.name.value }}</label>
</div>
</span>
</a>
</li>
错误:error TS2531: Object is possibly 'null'. statusesForm.get('closedStatuses')['controls']
如何修复此错误?