Twitter login "An error occurred while trying to load this page"

yountod

Redirect page following successful Twitter login fails when "Trusted Email" is null:

[2019-01-15 21:02:55] production.ERROR: TypeError: Argument 1 passed to Flarum\Forum\Auth\Registration::provideTrustedEmail() must be of the type string, null given, called in /xyz/pdq/vendor/flarum/auth-twitter/src/TwitterAuthController.php on line 85 and defined in /xyz/pdq/vendor/flarum/core/src/Forum/Auth/Registration.php:71

matteocontrini

Could you check that your Twitter dev application has the email permission enabled?

https://developer.twitter.com/en/apps/