diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index f4dcf711b65..f2471d122af 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -8528,7 +8528,9 @@ abstract class CommonObject
 					}
 				}
 			} else {
-				$queryarray[$field] = !empty($this->{$field}) ? $this->{$field} : 0;
+				// Note: If $this->{$field} is not defined, it means there is a bug into definition of ->fields or a missing declaration of property
+				// We should keep the warning generated by this because it is a bug somewhere else in code, not here.
+				$queryarray[$field] = $this->{$field};
 			}
 
 			if ($info['type'] == 'timestamp' && empty($queryarray[$field])) {