Cannot read property 'type' of null

[asmyshlyaev177]

Version

4.0.0

Browser and OS info

Chrome 63.0.3239.132 / Ubuntu 16.04 x64

Steps to reproduce

After last update in vue-devtools extension when i try to select any component i got error in console

Can't see data and component property.

Same situation in firefor browser. I tried to checkout code version from 12.01.2018 and have same problem.

What is expected?

I can select component and see data, properties, computed etc.

What is actually happening?

I got following error in console

Uncaught TypeError: Cannot read property 'type' of null
    at VM22763 backend.js:1
    at x (VM22763 backend.js:1)
    at t.a (VM22763 backend.js:1)
    at Object.y (VM22763 backend.js:1)
    at e (VM22763 backend.js:1)
    at e (VM22763 backend.js:1)
    at e (VM22763 backend.js:1)
    at e (VM22763 backend.js:1)
    at Object.t.stringifyStrict (VM22763 backend.js:1)
    at Object.t.stringify (VM22763 backend.js:1)

[Akryum]

Do you use vee-validate? If so, see #499 (comment)

[asmyshlyaev177]

Yes, we are. Version:
"vee-validate": "^2.0.0-rc.25",

[Akryum]

Try to update to 2.0.3.

[asmyshlyaev177]

It works! Thank you.

Also found hou you can improve code
lines 445-446, 462-463

https://github.com/vuejs/vue-devtools/blob/a79d9c55176ed8146b3631256a869d6938209c3e/src/backend/index.js#L445

this line
type: prop.type ? getPropType(prop.type) : 'any',
change to
type: prop && prop.type ? getPropType(prop.type) : 'any',

Same with options.type and
required: !!options.required,

I checked with old version vee-validate and no errors.