Product Hunt Verification Fails

[nurikabe]

Describe the bug
Clicking on Procuct Hunt "Link account" -> "Login with Twitter" results in 500 errror on https://api.producthunt.com/auth/twitter

Could be problem on Product Hunt side, but reporting just in case.

To Reproduce

1. Go to https://workchain.io/bounty
2. Click on Product Hunt "Link account"
3. From https://api.producthunt.com/v1/login click "Login with Twitter"
4. 500 error

Expected behavior
Should link account and return browser to WorkChain.io

Desktop (please complete the following information):

• OS: Windows 10
• Browser Chrome
• Version 70.0.3538.102

Additional context
Note that browser default language is set to "ja" (Japanese)