Use IsModEnabled

htdocs/ticket/class/cticketcategory.class.php

@@ -189,7 +189,7 @@ class CTicketCategory extends CommonObject
 		if (empty($conf->global->MAIN_SHOW_TECHNICAL_ID) && isset($this->fields['rowid'])) {
 			$this->fields['rowid']['visible'] = 0;
 		}
-		if (empty($conf->multicompany->enabled) && isset($this->fields['entity'])) {
+		if (!isModEnabled('multicompany') && isset($this->fields['entity'])) {
 			$this->fields['entity']['enabled'] = 0;
 		}