Describe the bug
As an admin, when I click on the website version link of a newsletter preview, a server error is displayed.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Admin panel → Newsletters
2. Click on Preview of not sent newsletter
3. Click on View it on the website.
4. See error

Expected behavior
I should be able to see the website version.

Screenshots


Extra data (please complete the following information):

• Device: all
• Device OS: all
• Browser: all
• Decidim Version: 0.25