diff --git a/mod/quiz/lib.php b/mod/quiz/lib.php
index 91f737e16d9..bc5bc49ec66 100644
--- a/mod/quiz/lib.php
+++ b/mod/quiz/lib.php
@@ -907,6 +907,10 @@ function quiz_print_possible_question_image($quizid, $question) {
 
     global $CFG;
 
+    if ($quizid == '') {
+        $quizid = '0';
+    }
+
     if ($question->image) {
         echo '<img border="0" src="';