In quiz activity, when we go to "Results-> Statistics" and try to download tables or report (Quiz information) or "Quiz structure analysis" in format csv, xls or ods we get an 500 error.

The debug log error are

PHP Fatal error:  Call to a member function close() on a non-object in /var/www/html/moodle/lib/classes/dataformat/spout_base.php on line 102, referer: http://xxx.xxxx.xx/mod/quiz/report.php?id=197196&mode=statistics

 Steps to reproduce:

1.- In a course create a quiz

2.- Answer the quiz with some students

3.- As teacher go to Results --> Statistics

4.- in "Quiz Information" section  or "Quiz structure analysis" section press "Download" selecting CSV, XLS or ODS format 

We test this in several moodle installation and we get the same error.