how to fixed this ERROR TypeError: Cannot read properties of undefined (reading 'length') in...

Why is the categoryJobLists.length given the error ERROR TypeError: Cannot read properties of undefined (reading 'length')

<ion-content>

<div *ngIf="categoryJobLists && categoryJobLists.length > 0">
<ion-grid>
<ion-row *ngFor="let categorysJobs of categoryJobLists">
<ion-col size="6" (click)="openJobDetailPage(categoryJobLists)">
<ion-card>
<ion-card-header>
<ion-card-title> {{categorysJobs.job_title}} </ion-card-title>
<ion-card-subtitle>Total Opening: {{categorysJobs.total_vacancies}} </ion-card-subtitle>
</ion-card-header>

<ion-card-content>
Open from {{categorysJobs.apply_from_date}}
</ion-card-content>
</ion-card>
</ion-col>
</ion-row>
</ion-grid>
</div>

<div *ngIf="categoryJobLists && categoryJobLists.length == 0">
<ion-chip>
<ion-icon name="close-circle-outline"></ion-icon>
<ion-label>Not Found</ion-label>
</ion-chip>
</div>

</ion-content>




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