Issue: Unable to parse `access_token`

Error Info
XenForo_Exception: Unable to parse `access_token` from `{"error":"invalid_grant","error_description":"Authorizat ion code doesn't exist or is invalid for the client","vwTemplateName":"DEFAULT"}` - library/bdApiConsumer/Helper/Api.php:39
Generated By: Unknown Account, Jan 2, 2018
Stack Trace

#0 /library/bdApiConsumer/XenForo/ControllerPublic/Register.php(48): bdApiConsumer_Helper_Api::getAccessTokenFromCode(Array, 'dd487acd506ad11...', 'https://...')
#1 /library/XenForo/FrontController.php(369): bdApiConsumer_XenForo_ControllerPublic_Register->actionExternal()
#2 /library/XenForo/FrontController.php(152): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#3 /index.php(13): XenForo_FrontController->run()
#4 {main}

Request State

array(3) {
["url"] => string(127) "https://site.com/register/external?provider=xxx&code=xxx&state="
["_GET"] => array(3) {
["provider"] => string(5) "xxx"
["code"] => string(40) "xxx"
["state"] => string(0) ""
}
["_POST"] => array(0) {
}
}

This may be a conflict with bd api.