avoid division by zero when the sum of grades is zero

diff --git a/mod/quiz/view.php b/mod/quiz/view.php
index 2f44df763d68aa4d4e2c557e4545f1742db04c22..382395dc48e55bf3adc27866d65c873d441b6076 100644 (file)
--- a/mod/quiz/view.php
+++ b/mod/quiz/view.php
@@ -113,7 +113,7 @@
             } else {
                 $timetaken = "-";
             }
-            if ($quiz->grade) {
+            if ($quiz->grade and $quiz->sumgrades) {
                 $attemptgrade = format_float(($attempt->sumgrades/$quiz->sumgrades)*$quiz->grade);
                 if ($attemptgrade == $mygrade) {
                     $attemptgrade = "<span class=\"highlight\">$attemptgrade</span>";