TypeError: Cannot read properties of null (reading '$implicit') with async pipe

I'm trying to find out what is the reason of issue:

It raises for this part of code:


<div ngbAccordion #accordion="ngbAccordion" >
<div ngbAccordionItem="first">
<span class="body-medium-text-l" ngbAccordionHeader>
<button ngbAccordionButton class="body-medium-text-m">{{ 'hub_repairs_open_requests' | translate }}</button>
</span>
<div ngbAccordionCollapse>
<div ngbAccordionBody>
<ng-container *ngFor="let return of dataService.returns | async"> <<== here
<app-repair-row [return ]="return "></app-repair-row>
</ng-container>
</div>
</div>
</div>
</div>

My investigation yielded no conclusions.

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