diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index d53b8829686..1eb661471ae 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -9135,6 +9135,11 @@ abstract class CommonObject
 	 */
 	public function setCategoriesCommon($categories, $type_categ = '', $remove_existing = true)
 	{
+		// Handle single category
+		if (!is_array($categories)) {
+			$categories = array($categories);
+		}
+
 		dol_syslog(get_class($this)."::setCategoriesCommon Oject Id:".$this->id.' type_categ:'.$type_categ.' nb tag add:'.count($categories), LOG_DEBUG);
 
 		require_once DOL_DOCUMENT_ROOT.'/categories/class/categorie.class.php';
@@ -9144,11 +9149,6 @@ abstract class CommonObject
 			return -1;
 		}
 
-		// Handle single category
-		if (!is_array($categories)) {
-			$categories = array($categories);
-		}
-
 		// Get current categories
 		$c = new Categorie($this->db);
 		$existing = $c->containing($this->id, $type_categ, 'id');