diff --git a/SeedDMS_Core/Core/inc.ClassDMS.php b/SeedDMS_Core/Core/inc.ClassDMS.php
index 991f21f01..de4e37330 100644
--- a/SeedDMS_Core/Core/inc.ClassDMS.php
+++ b/SeedDMS_Core/Core/inc.ClassDMS.php
@@ -2703,7 +2703,7 @@ class SeedDMS_Core_DMS {
 		if (is_object($this->getAttributeDefinitionByName($name))) {
 			return false;
 		}
-		if(!$objtype)
+		if($objtype < SeedDMS_Core_AttributeDefinition::objtype_all || $objtype > SeedDMS_Core_AttributeDefinition::objtype_documentcontent)
 			return false;
 		if(!$type)
 			return false;
diff --git a/SeedDMS_Core/package.xml b/SeedDMS_Core/package.xml
index 76b616b57..e0077eb64 100644
--- a/SeedDMS_Core/package.xml
+++ b/SeedDMS_Core/package.xml
@@ -24,6 +24,7 @@
  </stability>
  <license uri="http://opensource.org/licenses/gpl-license">GPL License</license>
  <notes>
+fix SeedDMS_Core_DMS::addAttributeDefinition() when objtype is 0
  </notes>
  <contents>
   <dir baseinstalldir="SeedDMS" name="/">