There is an issue in V20 Development Version that is
When a parent who has more than one children in school log in the home page for parent shows OH NO Error!
Here is error log
/public_html/cms/modules/Badges/moduleFunctions.php:20) in /public_html/cms/modules/Badges/moduleFunctions.php on line 20
The parent with single child is fine and there is no error for that.
You are requested to please look into it and fix it.
Looking forward to hearing from you.