MDL-15452 quiz navigation - followup - avoid a division by 0.

diff --git a/mod/quiz/attemptlib.php b/mod/quiz/attemptlib.php
index 90c913697648d55344137875b57a78a9b4d2c875..71aa8aed2b0464987a0b87112db250652da70be7 100644 (file)
--- a/mod/quiz/attemptlib.php
+++ b/mod/quiz/attemptlib.php
@@ -546,7 +546,7 @@ class quiz_attempt extends quiz {
             case QUESTION_EVENTCLOSE:
             case QUESTION_EVENTMANUALGRADE:
                 $options = $this->get_render_options($this->states[$questionid]);
-                if ($options->scores) {
+                if ($options->scores && $this->questions[$questionid]->maxgrade > 0) {
                     return question_get_feedback_class($state->last_graded->raw_grade /
                             $this->questions[$questionid]->maxgrade);
                 } else {