throw Cannot read properties of undefined (reading 'stop') on component unmount, and use nested watch. #5783
Description
Version
3.2.30
Reproduction link
Steps to reproduce
- please click 'Toggle' button in demo, you will see the error.
What is expected?
When the 'Toggle' button is clicked, the <Comp> component is unmounted normally.
What is actually happening?
'Toggle' button then change visible to false, then it will cause the <Comp> to be unmount, and throw error.
The issue is present in 3.2.30 and later.