diff --git a/inc/group_group.class.php b/inc/group_group.class.php
index 5e3d66c..3ee0666 100644
--- a/inc/group_group.class.php
+++ b/inc/group_group.class.php
@@ -161,7 +161,7 @@ public function getGroups($ticket_id, $removeAlreadyAssigned = true)
         // To do an escalation, the user must be in a group currently assigned to the ticket
         // or no group is assigned to the ticket
         // TODO : matching with "view all tickets (yes/no) option in profile user"
-        if ($ticket_groups !== [] && count(array_intersect($ticket_groups, $user_groups)) == 0) {
+        if ($ticket_groups !== [] && array_intersect($ticket_groups, $user_groups) === []) {
             return [];
         }
 
@@ -196,7 +196,7 @@ public function getGroups($ticket_id, $removeAlreadyAssigned = true)
             $groupname = $group_obj->fields['name'];
         }
 
-        if (count($groups) == 0) {
+        if ($groups === []) {
             Group_User::getUserGroups($_SESSION['glpiID']);
         }
 
diff --git a/inc/history.class.php b/inc/history.class.php
index 1c37f89..8e729c3 100644
--- a/inc/history.class.php
+++ b/inc/history.class.php
@@ -39,7 +39,7 @@ class PluginEscaladeHistory extends CommonDBTM
     public static function getFirstLineForTicket($tickets_id)
     {
         $found = self::getFullHistory($tickets_id);
-        if (count($found) == 0) {
+        if (count($found) === 0) {
             return false;
         } else {
             return array_pop($found);
@@ -49,7 +49,7 @@ public static function getFirstLineForTicket($tickets_id)
     public static function getlastLineForTicket($tickets_id)
     {
         $found = self::getFullHistory($tickets_id);
-        if (count($found) == 0) {
+        if (count($found) === 0) {
             return false;
         } else {
             return array_shift($found);
@@ -222,7 +222,7 @@ public static function getHistory($tickets_id, $full_history = false)
             echo "</div>";
 
             $i++;
-            if ($i == self::HISTORY_LIMIT && !$full_history) {
+            if ($i === self::HISTORY_LIMIT && !$full_history) {
                 break;
             }
         }
diff --git a/inc/ticket.class.php b/inc/ticket.class.php
index 5a85c1f..898271e 100644
--- a/inc/ticket.class.php
+++ b/inc/ticket.class.php
@@ -1035,30 +1035,21 @@ public static function cloneAndLink($tickets_id)
       SELECT null AS id, {$newID} as tickets_id, users_id, type, use_notification, alternative_email
       FROM glpi_tickets_users
       WHERE tickets_id = {$tickets_id} AND type != 2";
-        if (!$res = $DB->doQuery($query_users)) {
-            Session::addMessageAfterRedirect(__s('Error : adding actors (user)', 'escalade'), false, ERROR);
-            return;
-        }
+        $DB->doQuery($query_users);
 
         //groups
         $query_groups = "INSERT INTO glpi_groups_tickets
       SELECT null AS id, {$newID} as tickets_id, groups_id, type
       FROM glpi_groups_tickets
       WHERE tickets_id = {$tickets_id} AND type != 2";
-        if (!$res = $DB->doQuery($query_groups)) {
-            Session::addMessageAfterRedirect(__s('Error : adding actors (group)', "escalade"), false, ERROR);
-            return;
-        }
+        $DB->doQuery($query_groups);
 
         //add documents
         $query_docs = "INSERT INTO glpi_documents_items (documents_id, items_id, itemtype, entities_id, is_recursive, date_mod)
       SELECT documents_id, {$newID}, 'Ticket', entities_id, is_recursive, date_mod
       FROM glpi_documents_items
       WHERE items_id = {$tickets_id} AND itemtype = 'Ticket'";
-        if (!$res = $DB->doQuery($query_docs)) {
-            Session::addMessageAfterRedirect(__s('Error : adding documents', 'escalade'), false, ERROR);
-            return;
-        }
+        $DB->doQuery($query_docs);
 
         //add history to the new ticket
         $changes[0] = '0';