diff --git a/mod/quiz/report/responses/responses_options.php b/mod/quiz/report/responses/responses_options.php
index 7d9bbb856f555..64f1bb1a217cf 100644
--- a/mod/quiz/report/responses/responses_options.php
+++ b/mod/quiz/report/responses/responses_options.php
@@ -53,7 +53,9 @@ protected function get_url_params() {
         $params['qtext']      = $this->showqtext;
         $params['resp']       = $this->showresponses;
         $params['right']      = $this->showright;
-        $params['whichtries'] = $this->whichtries;
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            $params['whichtries'] = $this->whichtries;
+        }
         return $params;
     }
 
@@ -62,7 +64,9 @@ public function get_initial_form_data() {
         $toform->qtext      = $this->showqtext;
         $toform->resp       = $this->showresponses;
         $toform->right      = $this->showright;
-        $toform->whichtries = $this->whichtries;
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            $toform->whichtries = $this->whichtries;
+        }
 
         return $toform;
     }
@@ -73,7 +77,9 @@ public function setup_from_form_data($fromform) {
         $this->showqtext     = $fromform->qtext;
         $this->showresponses = $fromform->resp;
         $this->showright     = $fromform->right;
-        $this->whichtries    = $fromform->whichtries;
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            $this->whichtries = $fromform->whichtries;
+        }
     }
 
     public function setup_from_params() {
@@ -82,7 +88,9 @@ public function setup_from_params() {
         $this->showqtext     = optional_param('qtext', $this->showqtext,     PARAM_BOOL);
         $this->showresponses = optional_param('resp',  $this->showresponses, PARAM_BOOL);
         $this->showright     = optional_param('right', $this->showright,     PARAM_BOOL);
-        $this->whichtries    = optional_param('whichtries', $this->whichtries,     PARAM_ALPHA);
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            $this->whichtries    = optional_param('whichtries', $this->whichtries, PARAM_ALPHA);
+        }
     }
 
     public function setup_from_user_preferences() {
@@ -91,7 +99,9 @@ public function setup_from_user_preferences() {
         $this->showqtext     = get_user_preferences('quiz_report_responses_qtext', $this->showqtext);
         $this->showresponses = get_user_preferences('quiz_report_responses_resp',  $this->showresponses);
         $this->showright     = get_user_preferences('quiz_report_responses_right', $this->showright);
-        $this->whichtries    = get_user_preferences('quiz_report_responses_which_tries', $this->whichtries);
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            $this->whichtries    = get_user_preferences('quiz_report_responses_which_tries', $this->whichtries);
+        }
     }
 
     public function update_user_preferences() {
@@ -100,7 +110,9 @@ public function update_user_preferences() {
         set_user_preference('quiz_report_responses_qtext', $this->showqtext);
         set_user_preference('quiz_report_responses_resp',  $this->showresponses);
         set_user_preference('quiz_report_responses_right', $this->showright);
-        set_user_preference('quiz_report_responses_which_tries', $this->whichtries);
+        if (quiz_allows_multiple_tries($this->quiz)) {
+            set_user_preference('quiz_report_responses_which_tries', $this->whichtries);
+        }
     }
 
     public function resolve_dependencies() {