Parse error when creating new categories within a quiz

We have recently upgraded from 1.6.3 to 1.8.2 and have discovered a parse error when you try to create quiz categories inside moodle.

The error points to line 442 of moodle/question/category_class.php

echo '<input type="hidden" name="sesskey" value=" ' . $USER->sesskey . ' " />';s

I'm not sure if anyone has come across this but luckily its not too bad, and the solution seems to be to remove the random s at the end of the line which we assume is a typo.

So the new line should display

echo '<input type="hidden" name="sesskey" value=" ' . $USER->sesskey . ' " />';

Thanks