Hi

I got informed about an Error with the E-Mail reports and i could reproduce it with your demo installation. It seems to be a simple issue with the URL encoding. It was working in v3.11.0 and seems to be introduced in v3.12.0

Reproduce:

• Visit: https://demo.matomo.org
• Click on Administration
• Go to Personal Email Reports
• Click on the DatePicker and select date range and apply

Current not working URL:
https://demo.matomo.org/index.php?module=ScheduledReports&action=index&idSite=62&period=range&date=2019-11-01%2C2019-11-11

Working URL:
https://demo.matomo.org/index.php?module=ScheduledReports&action=index&idSite=62&period=range&date=2019-11-01,2019-11-11