Error with X callback?

[fergalmoran]

Steps to reproduce the problem

Add X service with correct API Key & API Secret

Add account.
Choose X profile.
Redirected to X authorize page.
Click "Authorize app"

Redirected to mixpost error page "Undefined property: stdClass::$data"

Expected behaviour

X account should have been added

Actual behaviour

Undefined property: stdClass::$data`

Detailed description

Trying to add X account - get redirected to the Authorize page, click "Authorize App" and get redirected back to site with error

Undefined property: stdClass::$data

Error page here

Specifications

Mixpost 1.7.2.0