diff --git a/htdocs/opensurvey/card.php b/htdocs/opensurvey/card.php
index 26cf85cb3d6..3fa238894e1 100644
--- a/htdocs/opensurvey/card.php
+++ b/htdocs/opensurvey/card.php
@@ -46,11 +46,6 @@ if (GETPOST('id')) {
 $object=new Opensurveysondage($db);
 
 $result=$object->fetch(0, $numsondage);
-if ($result <= 0)
-{
-	dol_print_error($db,$object->error);
-	exit;
-}
 
 $expiredate=dol_mktime(0, 0, 0, GETPOST('expiremonth'), GETPOST('expireday'), GETPOST('expireyear'));
 
@@ -206,7 +201,17 @@ foreach ($toutsujet as $value)
 $toutsujet=str_replace("@","<br>",$toutsujet);
 $toutsujet=str_replace("°","'",$toutsujet);
 
-
+if (empty($object->ref))     // For survey, id is a hex string
+{
+    $langs->load("errors");
+    print $langs->trans("ErrorRecordNotFound");
+    
+    llxFooter();
+    
+    $db->close();
+    exit;
+}
+    
 print '<form name="updatesurvey" action="'.$_SERVER["PHP_SELF"].'?id='.$numsondage.'" method="POST">'."\n";
 print '<input type="hidden" name="action" value="update">';
 
@@ -442,6 +447,6 @@ print '</form>';
 
 print '<br>';
 
-llxFooterSurvey();
+llxFooter();
 
 $db->close();
diff --git a/htdocs/opensurvey/class/opensurveysondage.class.php b/htdocs/opensurvey/class/opensurveysondage.class.php
index 02952f4bf75..5ad27731d88 100644
--- a/htdocs/opensurvey/class/opensurveysondage.class.php
+++ b/htdocs/opensurvey/class/opensurveysondage.class.php
@@ -228,8 +228,7 @@ class Opensurveysondage extends CommonObject
                 $obj = $this->db->fetch_object($resql);
 
 				$this->id_sondage = $obj->id_sondage;
-				//For compatibility
-				$this->ref = $this->id_sondage;
+				$this->ref = $this->id_sondage;             //For compatibility
 
 				$this->commentaires = $obj->description;	// deprecated
 				$this->description = $obj->description;
diff --git a/htdocs/public/opensurvey/studs.php b/htdocs/public/opensurvey/studs.php
index 834f17b8b2c..6f242a00544 100644
--- a/htdocs/public/opensurvey/studs.php
+++ b/htdocs/public/opensurvey/studs.php
@@ -41,7 +41,6 @@ if (GETPOST('sondage'))
 
 $object=new Opensurveysondage($db);
 $result=$object->fetch(0,$numsondage);
-if ($result <= 0) dol_print_error('','Failed to get survey id '.$numsondage);
 
 $nblignes=$object->fetch_lines();
 
@@ -241,6 +240,16 @@ $arrayofjs=array();
 $arrayofcss=array('/opensurvey/css/style.css');
 llxHeaderSurvey($object->titre, "", 0, 0, $arrayofjs, $arrayofcss);
 
+if (empty($object->ref))     // For survey, id is a hex string
+{
+    $langs->load("errors");
+    print $langs->trans("ErrorRecordNotFound");
+
+    llxFooterSurvey();
+
+    $db->close();
+    exit;
+}
 
 // Define format of choices
 $toutsujet=explode(",",$object->sujet);