Assertion Failed: You called estimateElement height without a fallbackHeight

[GnanaAjana]

I am using the vertical collection for power select.

Issue: In power-select option group, items are loaded on the scroll. On scrolling fast am getting an error as

Assertion Failed: You called estimateElement height without a fallbackHeight

list item will have sub-list items. In those cases, previous li element will not be there. So getting this error.

Is there any other way to resolve this.

Version: "ember-cli": "2.12.3", "@html-next/vertical-collection": "1.0.0-beta.12"