When adding a new item in ArrayList, yup's test is called with an undefined value in Formik v2

[lourenci]

🐛 Bug report

Current Behavior

When adding a new item in ArrayList, yup's test is called with an undefined value. This is not true on 1.5.8 version.

Expected behavior

According to the 1.5.8 version, the test should be being called with an empty value.

Reproducible example

Try to add a new item in an ArrayField and see the errors in the console.

The same example in both Formik's version:
1.5.8 - not showing errors in the console

2.1.1 - showing errors in the console

Your environment

Software	Version(s)
Formik	2.1.1
React	16.12.0