### Is there an existing issue for this? - [x] I have searched the existing issues and this is a new bug. ### Current Behavior viewportEl.value.checkVisibility() throw Error ### Expected Behavior viewportEl.value.checkVisibility() to be viewportEl.value?.checkVisibility() ### Steps To Reproduce _No response_ ### Minimal reproduction of the issue with CodeSandbox _No response_ ### Relevant log output ```shell ``` ### Anything else? _No response_