Version

2.5.14

Reproduction link

https://jsfiddle.net/50wL7mdz/175425/

Steps to reproduce

1. Including vue(v.2.5.14) and element.io styles and library.
2. Opening new form.
3. Opening new form element.
4. Using custom date picker element.

What is expected?

It is expected to render a custom UI component for date picking.

What is actually happening?

The element is not being render as the console is filled with errors.

[Vue warn]: Error in render: "RangeError: Maximum call stack size exceeded", vue.js:597
RangeError: Maximum call stack size exceeded, vue.js:1745

The issue is related to the latest vue.js version as it is working as expected with all up to 2.5.13.