diff --git a/lib/documentmanagement/documentcontentversion.inc.php b/lib/documentmanagement/documentcontentversion.inc.php
index 7d62f10..e21202e 100644
--- a/lib/documentmanagement/documentcontentversion.inc.php
+++ b/lib/documentmanagement/documentcontentversion.inc.php
@@ -6,7 +6,7 @@
  * License Version 1.1.2 ("License"); You may not use this file except in
  * compliance with the License. You may obtain a copy of the License at
  * http://www.knowledgetree.com/KPL
- * 
+ *
  * Software distributed under the License is distributed on an "AS IS"
  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
  * See the License for the specific language governing rights and
@@ -17,9 +17,9 @@
  *    (ii) the KnowledgeTree copyright notice
  * in the same form as they appear in the distribution.  See the License for
  * requirements.
- * 
+ *
  * The Original Code is: KnowledgeTree Open Source
- * 
+ *
  * The Initial Developer of the Original Code is The Jam Warehouse Software
  * (Pty) Ltd, trading as KnowledgeTree.
  * Portions created by The Jam Warehouse Software (Pty) Ltd are Copyright
@@ -103,7 +103,7 @@ class KTDocumentContentVersion extends KTEntity {
             $this->iSize = 0;
         }
         if (empty($this->iMimeTypeId)) {
-            $this->iMimeTypeId = 0;
+            $this->iMimeTypeId = 9;
         }
         if (is_null($this->iMajorVersion)) {
             $this->iMajorVersion = 0;
diff --git a/sql/mysql/upgrade/3.5.0/relation_friendly.sql b/sql/mysql/upgrade/3.5.0/relation_friendly.sql
index ce2aa91..bdb3099 100644
--- a/sql/mysql/upgrade/3.5.0/relation_friendly.sql
+++ b/sql/mysql/upgrade/3.5.0/relation_friendly.sql
@@ -3,3 +3,8 @@ alter table `folders` change `owner_id`  `owner_id`  int  NULL;
 alter table `index_files` change `document_id`  `document_id`  int NOT NULL;
 alter table `index_files` change `user_id`  `user_id`  int NOT NULL;
 alter table `type_workflow_map` change `workflow_id`  `workflow_id` int  NULL;
+alter table document_content_version change mime_id mime_id int null default 9;
+alter table documents change owner_id owner_id int null;
+alter table documents change parent_id parent_id int null;
+update documents set owner_id=null where owner_id=0;
+update folders set parent_id=null where parent_id=0;