Angular Material Autocomplete force selection

In my angular 5 application, I have some matAutocomplete, but I want to force the selection of one of the suggestions, so I am following this approach: stackblitz but for some reason in one case I have an issue:

Cannot read property 'panelClosingActions' of undefined at CustomerDetailComponent.countryClosingActions (customer-detail.component.ts:199) at CustomerDetailComponent.ngAfterViewInit
​

I have multiple matAutocomplete but only this one have problems. (info about this method is here github

html

<mat-form-field>
<input matInput #nation placeholder="{{'customer.detail.labels.country'
| translate }}" required [matAutocomplete]="tdAuto" name="country"
#count="ngModel" [(ngModel)]="selected.country"
(ngModelChange)="searchCountry($event)">
<mat-autocomplete #tdAuto="matAutocomplete" [displayWith]="displayFn">
<mat-option (onSelectionChange)="setCountry(country)" *ngFor="let country of countries" [value]="country">
<div class="row">
<img src="assets/img/flags24/{{country.alpha2Code | lowercase}}.png" />
<span>{{country.name}} ({{country.alpha2Code}})</span>
</div>
</mat-option>
</mat-autocomplete>
</mat-form-field>


component

@ViewChild('nation', { read: MatAutocompleteTrigger }) trigger: MatAutocompleteTrigger;
subscription: Subscription;


ngAfterViewInit() {
this.countryClosingActions();
}

private countryClosingActions(): void {
if (this.subscription && !this.subscription.closed) {
this.subscription.unsubscribe();
}

this.subscription = this.trigger.panelClosingActions
.subscribe(e => {
console.log('closing')
if (!e || !e.source) {
this.selected.country = null;
this.selfCountry = null;
}
},
err => this.countryClosingActions(),
() => this.countryClosingActions());
}

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