Undo drop in nz-zorro tree

I have following code for the tree. HTML:

<nz-tree
[nzTreeTemplate]="nzTreeTemplate"
(nzOnDrop)="onNzOnDrop($event)" [nzData]="nodes" nzDraggable>
</nz-tree>
<ng-template #nzTreeTemplate let-node>
...
</ng-template>


Component:

onNzOnDrop($event: NzFormatEmitEvent) {
[doing something that causes error]
[revert the drop]
}


How to undo the drop in this case? Thank you.

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