diff --git a/backend/TE/TakeExercise.php b/backend/TE/TakeExercise.php
index cc0b02885c9d9c5b54911bb6c55f9809fb9ac026..167ee6b0c98b0ee6a23e45dbd2f45a85f8dde217 100644
--- a/backend/TE/TakeExercise.php
+++ b/backend/TE/TakeExercise.php
@@ -316,8 +316,42 @@ class TakeExerciseFrame extends ExerciseFrame
             $moreSettings[ 'updatedMinutiaeTimestamp' ] = $db->getAssignmentSubmissionTime( $aid, 'ANALYSIS' );
         }
         
-        if( ! $isTutorReview && $progress[ 'step' ] == 'ANALYSIS' )
-            $moreSettings[ 'defaultSuitabilityApproach' ] = $db->getSuitabilityApproach();
+        if( ! $isTutorReview )
+        {
+            if( $progress[ 'step' ] == 'ANALYSIS' )
+            {
+                $moreSettings[ 'defaultSuitabilityApproach' ] = $db->getSuitabilityApproach();
+            } else if( $progress[ 'step' ] == 'COMPARISON' && $progress[ 'status' ] < 4 )
+            {
+                if( $db->isMarkOfNoValue( $aid ) )
+                {
+                    $jsCode .= "
+                    settings[ 'onExerciseStartup' ] = function( pianos, params ) 
+					{
+						if ( params.phase == 'comparison' )
+						{
+							var dlg = $( '<div />' )
+                                .text( 'The latent has been declared as no-value. No comparison is needed in this case.' );
+                            
+							pianos.dialog( dlg, {
+								modal: true,
+								title: 'Information',
+								close: function() {
+                                    $( this ).remove();
+                                    window.location.href = '?';
+                                },
+								buttons: {
+									'Return to the homepage': function() {
+                                        $( this ).dialog( 'close' );
+                                        window.location.href = '?';
+                                    }
+								}
+							} );
+                        }
+                    };";
+                }
+            }
+        }
         
         if( isset( $moreSettings ) )
             $settings = array_merge( $settings, $moreSettings );