Angular: Cannot read property 'component' of null

Ok. I managed to fix this. I do not fully understand but here is what I found:

• The Cannot read property 'component' of null disapear when the router-outlet is included only once in the app HTML (e.g: contrary to the inclusion of router-outlet in each of multiple branches of the ng-if condition)

• When I change the conditional inclusion of router-outlet from

this form:

    <div *nfIf="condition">
        <router-outlet></router-outlet>
    </div>
    <div *nfIf="!condition">
        <router-outlet></router-outlet>
    </div>

to this form:

    <div *nfIf="condition;else notcondition">
        <router-outlet></router-outlet>
    </div>
    <ng-template #notcondition>
        <router-outlet></router-outlet>
    </ng-template>

I have no issue navigating from login page to login page with parameters.