diff --git a/mod/quiz/report/statistics/tests/fixtures/responsecounts00.csv b/mod/quiz/report/statistics/tests/fixtures/responsecounts00.csv
index 50ba9cae4c9..60de822eb35 100644
--- a/mod/quiz/report/statistics/tests/fixtures/responsecounts00.csv
+++ b/mod/quiz/report/statistics/tests/fixtures/responsecounts00.csv
@@ -10,7 +10,7 @@ slot,randq,variant,subpart,modelresponse,actualresponse,totalcount
 2,,1,1,[NO MATCH],-0.2,1
 2,,1,1,[NO MATCH],-1,1
 2,,4,1,{a} + {b} (±0.01 Relative),19.4,2
-2,,4,1,"[NO RESPONSE]",,1
+2,,4,1,[NO MATCH],0,1
 2,,4,1,[NO MATCH],-0.4,1
 3,,1,1,frog: amphibian,amphibian,25
 3,,1,2,cat: mammal,mammal,24
diff --git a/question/classes/statistics/responses/analysis_for_class.php b/question/classes/statistics/responses/analysis_for_class.php
index 42c4aff5249..872f020e603 100644
--- a/question/classes/statistics/responses/analysis_for_class.php
+++ b/question/classes/statistics/responses/analysis_for_class.php
@@ -145,7 +145,7 @@ class analysis_for_class {
             return true;
         } else if (count($actualresponses) === 1) {
             $singleactualresponse = reset($actualresponses);
-            return $singleactualresponse != $this->modelresponse;
+            return (string)$singleactualresponse != $this->modelresponse;
         }
         return false;
     }
diff --git a/question/type/numerical/question.php b/question/type/numerical/question.php
index 8df2ce93486..c86f2fffc54 100644
--- a/question/type/numerical/question.php
+++ b/question/type/numerical/question.php
@@ -249,7 +249,7 @@ class qtype_numerical_question extends question_graded_automatically {
     }
 
     public function classify_response(array $response) {
-        if (empty($response['answer'])) {
+        if (!$this->is_gradable_response($response)) {
             return array($this->id => question_classified_response::no_response());
         }