diff --git a/ChangeLog b/ChangeLog
index 4c717ab680d..e1d7f482be2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -26,6 +26,7 @@ English Dolibarr ChangeLog
 - Fix: [ bug #824 ] MAIN_DB_PREFIX not use into dictionnary
 - Fix: [ bug #828 ] Error when code_region is not a number in llx_c_regions (with postgres)
 - Fix: [ bug #857 ] Invoice created from shipment does not have the order discount
+- Fix: [ bug #856 ] (Holidays module) Mail error if destination user doesn't have an email
 
 
 ***** ChangeLog for 3.3.1 compared to 3.3 *****
diff --git a/htdocs/holiday/fiche.php b/htdocs/holiday/fiche.php
index f50c77e4fe6..3d3572f20cd 100644
--- a/htdocs/holiday/fiche.php
+++ b/htdocs/holiday/fiche.php
@@ -276,6 +276,12 @@ if ($action == 'confirm_send')
             $destinataire->fetch($cp->fk_validator);
             $emailTo = $destinataire->email;
 
+            if (!$emailTo)
+            {
+                header('Location: fiche.php?id='.$_GET['id']);
+                exit;
+            }
+
             // From
             $expediteur = new User($db);
             $expediteur->fetch($cp->fk_user);
@@ -385,6 +391,12 @@ if($action == 'confirm_valid')
             $destinataire->fetch($cp->fk_user);
             $emailTo = $destinataire->email;
 
+            if (!$emailTo)
+            {
+                header('Location: fiche.php?id='.$_GET['id']);
+                exit;
+            }
+
             // From
             $expediteur = new User($db);
             $expediteur->fetch($cp->fk_validator);
@@ -453,6 +465,12 @@ if ($action == 'confirm_refuse')
                 $destinataire->fetch($cp->fk_user);
                 $emailTo = $destinataire->email;
 
+                if (!$emailTo)
+                {
+                    header('Location: fiche.php?id='.$_GET['id']);
+                    exit;
+                }
+
                 // From
                 $expediteur = new User($db);
                 $expediteur->fetch($cp->fk_validator);
@@ -524,6 +542,12 @@ if ($action == 'confirm_cancel' && $_GET['confirm'] == 'yes')
             $destinataire->fetch($cp->fk_user);
             $emailTo = $destinataire->email;
 
+            if (!$emailTo)
+            {
+                header('Location: fiche.php?id='.$_GET['id']);
+                exit;
+            }
+
             // From
             $expediteur = new User($db);
             $expediteur->fetch($cp->fk_validator);