The error_report.php blindly tries to use expected parameters without checking that they are present leading to many PHP errors.
Increasing priority as this can lead to information disclosure and thus is a security issue.
you mean when just calling error_report.php in a URL without parameters?
Should be better with https://github.com/phpmyadmin/phpmyadmin/commit/677e4496b77b653ac9311806669a0e562d701436
Another fix in 70282478ec43bbf86f55bcba2365b67bc18f17f4, hopefully it is everything now.