[TextBox] throws error when used with Formly

[svetq]

Describe the bug
When integrating a Kendo UI for Angular TextBox component with Formly as demonstrated in the following article:

https://www.telerik.com/kendo-angular-ui/components/forms/how-to/integration-with-formly/

the following error is thrown:

TypeError: Cannot read property 'unsubscribe' of undefined

To Reproduce
Please check the following example:
https://stackblitz.com/edit/angular-zijgem-emrsgm?file=app%2Ftext-field.component.ts

What could be done as a workaround is to add *ngIf="true" to the kendo-textbox:

    <kendo-textbox
      *ngIf="true"
       ...
    >
    </kendo-textbox>

[Raisolution]

Issue has been addressed in v8.0.0 and later of the kendo-angular-inputs package.

https://stackblitz.com/edit/angular-keic49-f6cegs?file=app%2Fapp.component.ts