Allow drag false in ac-toolbar causing error in Routing.

[pratimakulkarni]

Hello,
I have added on cesium map. Allow Drag property is set as false , as i don't want it.
Now if i route to another page , then there is error caused due to allow drag. It throws error as follows.

TypeError: Cannot read property 'unsubscribe' of undefined at AcToolbarComponent.ngOnDestroy (angular-cesium.js?9eb6:10163).
Problem is in angular-cesium.js , where its unsubscribing this.subscription which is undefined as its not true.
I have added screen shot of the code in angular-cesium.js where its causing problem.
Please let me know if there is any solution for this. Thanks.