I was able to reproduce the bug after switching my interface language to Arabic. Previewing the activity summary works correctly in German or English (with ASCII numbers), but fails with Arabic numerals.
Steps to reproduce:
- Change your interface language to Arabic
- Navigate to
/admin/email/preview-digest
- Select a date in the date picker and refresh
- Expected result: You see the summary as you would when your interface is in English
- Actual result: No summary, just endless spinning in the interface, error 500 in the browser console, entry in /logs
- Reload the page to stop the spinner
- Enter an email and click “send”
- Expected result: The summary is sent as it would be when your interface is in English
- Actual result: Pop-up with internal server error, no email is sent, error 500 in the browser console, entry in /logs