Steps to reproduce the issue

• Install Joomla 4.0
• Adjust Options
  • GitHub Authentication => make sure you have your GitHub Authentication Method filled
  • GitHub Repository =>
    • GitHub Repository = Custom
    • Custom Project Owner = joomla
    • Custom Project Repository = cassiopeia
• Save & Close
• _Fetch Data -

Expected result

No error

Actual result

A modal appears with the following error message:

COM_PATCHTESTER_FETCH_AN_ERROR_HAS_OCCURRED

Notice: Undefined offset: 0 in /Users/hans2103/Sites/joomla4/public_html/libraries/vendor/joomla/database/src/DatabaseQuery.php on line 464
{"success":false,"message":"Column count doesn't match value count at row 1","messages":null,"data":null}

I think it is a false positive, since the actual data has been fatched.

System information (as much as possible)

Additional comments