下拉框组件虚构时会崩

[18469645]

NzDropDownComponent.prototype.ngOnDestroy = function () {
this._subscription && this._subscription.unsubscribe();
};

当页面跳转，调用页面组件里下拉组件的虚构函数时，会崩在这里this._subscription.unsubscribe();。改成这样 this._subscription && this._subscription.unsubscribe();才正常。应该是虚构时this._subscription这个对像已不存在

[wilsoncook]

Perhaps you call ngOnDestroy (in)directly before nz-dropdown's ngAfterViewInit, the _subscription is initialized at ngAfterViewInit? Would u pls provider more information about your dev scene or code to determine whether needs judging conditions here.

[osbertngok]

Confirm can reproduce this. May need some time to do a minimal reproduceable case.

[ryancui92]

+1
the nz-dropdown component remains after navigate to another route.

[lock]

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