Summary: Changing the time period for the row evolution graph not works, when I'm comparing two periods for a single page. It leads to an exception.

Steps to reproduce:

1. Select period "Month" and compare it to "Previous year" in the Date picker above
2. Goto Behaviour-->Pages and select one page and open "Open row evolution"
3. Click "Pick a row to compare" and select the same page with the period for the previous year. Now the row evolution opens again.
4. If I try to select another "time period" for the graph (I try to select "Day" - see screenshot please) then nothing happens (in the background/ Log I find an exception : Uncaught exception: /is/htdocs/wp11188790_QHUN7F9B27/www/piwik/core/Period/Factory.php(131): Der Zeitraum '' wird nicht unterstützt. Versuchen Sie es stattdessen mit einem der folgenden: day, week, month, year, range

Comparing periods only works in the graph, if the selected period in the date picker above is the same like for the graph,

• Matomo Version: 4.2.1, 4.3