🇺🇸United States dumbtube Sacramento
I saw this when moving from php7.4 to 8.1
taking a quiz, after answering the first question and clicking on 'Next' results in the Fatal PHP error seen above.
Ii fixed it by changing the two lines in the functions getNext() and getPrevious() from:
if ($qra == $this) {
to
if ($qra === $this) {
and things seem to work as before.