[v4] Unregister form field 'indexOf' of undefined

[exodusanto]

Versions

• vee-validate: 4.0.0-alpha.6
• vue: 3.0.0-rc.5

Describe the bug
Using vue-route, if I change route from a view with a form to another one in console comes out this error.

Uncaught (in promise) TypeError: Cannot read property 'indexOf' of undefined
    at Object.unregister (vee-validate.esm.js:741)
    at vee-validate.esm.js:429

I think the problem is here, if the field has field.idx === -1 the object value will be deleted but the line after indexOf is called using that deleted value

[logaretm]

It is indeed a bug, thank you for the investigation as well. An early return should do it.

[exodusanto]

Perfect, it works!

[andy3520]

This issue also occurs with hot reload

vee-validate: 4.0.0-alpha.6
vue: 3.0.0-rc.5

• Change value
• Save
• Hot reload throw error

vee-validate.esm.js?7bb1:740 Uncaught (in promise) TypeError: Cannot read property 'indexOf' of undefined
    at Object.unregister (vee-validate.esm.js?7bb1:740)
    at eval (vee-validate.esm.js?7bb1:429)

[logaretm]

@andy3520 try with Alpha 8

[andy3520]

@logaretm on the test, solved. Thank you.