diff --git a/htdocs/core/class/html.formticket.class.php b/htdocs/core/class/html.formticket.class.php
index 9503d073268..5ba1465f7b4 100644
--- a/htdocs/core/class/html.formticket.class.php
+++ b/htdocs/core/class/html.formticket.class.php
@@ -1000,8 +1000,8 @@ class FormTicket
 				print '<option value="">'.((is_numeric($empty) || $empty == 'ifone') ? '&nbsp;' : $empty).'</option>';
 			}
 
-			if (is_array($ticketstat->cache_category_tickets) && count($ticketstat->cache_category_tickets)) {
-				foreach ($ticketstat->cache_category_tickets as $id => $arraycategories) {
+			if (is_array($conf->cache['category_tickets']) && count($conf->cache['category_tickets'])) {
+				foreach ($conf->cache['category_tickets'] as $id => $arraycategories) {
 					// Exclude some record
 					if ($publicgroups) {
 						if (empty($arraycategories['public'])) {
@@ -1044,7 +1044,7 @@ class FormTicket
 						print ' selected="selected"';
 					} elseif ($arraycategories['use_default'] == "1" && empty($selected) && (!$empty || $empty == 'ifone')) {
 						print ' selected="selected"';
-					} elseif (count($ticketstat->cache_category_tickets) == 1 && (!$empty || $empty == 'ifone')) {	// If only 1 choice, we autoselect it
+					} elseif (count($conf->cache['category_tickets']) == 1 && (!$empty || $empty == 'ifone')) {	// If only 1 choice, we autoselect it
 						print ' selected="selected"';
 					}
 
diff --git a/htdocs/ticket/class/api_tickets.class.php b/htdocs/ticket/class/api_tickets.class.php
index 2d0fca7f77a..6b2d9e759c9 100644
--- a/htdocs/ticket/class/api_tickets.class.php
+++ b/htdocs/ticket/class/api_tickets.class.php
@@ -554,7 +554,6 @@ class Tickets extends DolibarrApi
 			"cache_msgs_ticket",
 			"cache_logs_ticket",
 			"cache_types_tickets",
-			"cache_category_tickets",
 			"regeximgext",
 			"labelStatus",
 			"labelStatusShort",
diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index 35bf143e0fe..92c95699183 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -216,11 +216,6 @@ class Ticket extends CommonObject
 	 */
 	public $cache_types_tickets;
 
-	/**
-	 * @var array<int,array{code:string,use_default:int,pos:int,public:int,active:int,force_severity:int,fk_parent:int,label:string}>	Cache of Ticket categories
-	 */
-	public $cache_category_tickets;
-
 	/**
 	 * @var array<int,array{private:0|1|'0'|'1',fk_user_author:int,fk_contact_author?:int,message:string}> cache msgs ticket
 	 */
@@ -1384,9 +1379,9 @@ class Ticket extends CommonObject
 	 */
 	public function loadCacheCategoriesTickets($publicgroup = -1)
 	{
-		global $langs;
+		global $conf, $langs;
 
-		if ($publicgroup == -1 && !empty($this->cache_category_tickets) && count($this->cache_category_tickets)) {
+		if ($publicgroup == -1 && !empty($conf->cache['category_tickets']) && count($conf->cache['category_tickets'])) {
 			// Cache already loaded
 			return 0;
 		}
@@ -1408,18 +1403,18 @@ class Ticket extends CommonObject
 			$i = 0;
 			while ($i < $num) {
 				$obj = $this->db->fetch_object($resql);
-				$this->cache_category_tickets[$obj->rowid]['code'] = $obj->code;
-				$this->cache_category_tickets[$obj->rowid]['use_default'] = $obj->use_default;
-				$this->cache_category_tickets[$obj->rowid]['pos'] = $obj->pos;
-				$this->cache_category_tickets[$obj->rowid]['public'] = $obj->public;
-				$this->cache_category_tickets[$obj->rowid]['active'] = $obj->active;
-				$this->cache_category_tickets[$obj->rowid]['force_severity'] = $obj->force_severity;
-				$this->cache_category_tickets[$obj->rowid]['fk_parent'] = $obj->fk_parent;
+				$conf->cache['category_tickets'][$obj->rowid]['code'] = $obj->code;
+				$conf->cache['category_tickets'][$obj->rowid]['use_default'] = $obj->use_default;
+				$conf->cache['category_tickets'][$obj->rowid]['pos'] = $obj->pos;
+				$conf->cache['category_tickets'][$obj->rowid]['public'] = $obj->public;
+				$conf->cache['category_tickets'][$obj->rowid]['active'] = $obj->active;
+				$conf->cache['category_tickets'][$obj->rowid]['force_severity'] = $obj->force_severity;
+				$conf->cache['category_tickets'][$obj->rowid]['fk_parent'] = $obj->fk_parent;
 
 				// If  translation exists, we use it to store already translated string.
 				// Warning: You should not use this and recompute the translated string into caller code to get the value into expected language
 				$label = ($langs->trans("TicketCategoryShort".$obj->code) != "TicketCategoryShort".$obj->code ? $langs->trans("TicketCategoryShort".$obj->code) : ($obj->label != '-' ? $obj->label : ''));
-				$this->cache_category_tickets[$obj->rowid]['label'] = $label;
+				$conf->cache['category_tickets'][$obj->rowid]['label'] = $label;
 
 				$i++;
 			}