ng-bootstrap: Problems using accordion inside accordion with Angular 4

I need to use an accordion with other accordions inside. When i was using Angular 2, i worked perfect but when i update to angular 4 using angular-cli 1.0, It stops working.

Here is the code:

<ngb-accordion>
    <ngb-panel title="First panel">
        <template ngbPanelContent>
            <ngb-accordion>
                <ngb-panel id="1" title="First panel">
                    <template ngbPanelContent>
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                    </template>
                </ngb-panel>
            </ngb-accordion>
        </template>
    </ngb-panel>
</ngb-accordion>