Question getBoundingClientRect problem in an angular application

Hey,

I have a SPA and on a page there is a Unity WebGL container. I build the project with Unity 2020.3.24f1 and it works fine.

I upgraded to a newer version of Unity (2021.3.13f1), but a problem occurred. After I change to another page (leaving the unityscene) my browser's console log is spammed everytime I move the mouse.

Code (JavaScript):

1. Unhandled exception occurred: Cannot read properties of null (reading 'getBoundingClientRect')
2. Stack: TypeError: Cannot read properties of null (reading 'getBoundingClientRect')

I tried different ways (quit in ngOnDestroy, moved UnityInstance in a seperate service), but nothing helped to quit the Unity Instance fast/safe enough.

Has anyone a solution for a Unity WebGL in an angular component?

Thank you