diff --git a/install/update-6.0.0/update-sqlite3.sql b/install/update-6.0.0/update-sqlite3.sql
index 835206910..6bc037102 100644
--- a/install/update-6.0.0/update-sqlite3.sql
+++ b/install/update-6.0.0/update-sqlite3.sql
@@ -1,6 +1,6 @@
 BEGIN;
 
-ALTER TABLE `tblDocumentContent` ADD COLUMN `revisiondate` TEXT NOT NULL;
+ALTER TABLE `tblDocumentContent` ADD COLUMN `revisiondate` TEXT default NULL;
 
 ALTER TABLE `tblUsers` ADD COLUMN `secret` varchar(50) default NULL;
 
@@ -31,11 +31,11 @@ CREATE TABLE `new_tblWorkflowLog` (
 
 INSERT INTO `new_tblWorkflowLog` (`id`, `workflowdocumentcontent`, `userid`, `transition`, `date`, `comment`) SELECT `a`.`id`, `b`.`id`, `a`.`userid`, `a`.`transition`, `a`.`date`, `a`.`comment` FROM `tblWorkflowLog` `a` LEFT JOIN `new_tblWorkflowDocumentContent` `b` ON `a`.`document`=`b`.`document` AND `a`.`version`=`b`.`version` AND `a`.`workflow`=`b`.`workflow` WHERE `b`.`document` IS NOT NULL;
 
-DROP TABLE `tblWorkflowLog`;
+ALTER TABLE `tblWorkflowLog` RENAME TO `old_tblWorkflowLog`;
 
 ALTER TABLE `new_tblWorkflowLog` RENAME TO `tblWorkflowLog`;
 
-DROP TABLE `tblWorkflowDocumentContent`;
+ALTER TABLE `tblWorkflowDocumentContent` RENAME TO `old_tblWorkflowDocumentContent`;
 
 ALTER TABLE `new_tblWorkflowDocumentContent` RENAME TO `tblWorkflowDocumentContent`;
 
@@ -154,8 +154,6 @@ ALTER TABLE tblUsers RENAME TO old_tblUsers;
 
 ALTER TABLE new_tblUsers RENAME TO tblUsers;
 
-DROP TABLE old_tblUsers;
-
 CREATE TABLE `tblAros` (
   `id` INTEGER PRIMARY KEY AUTOINCREMENT,
   `parent` INTEGER,
@@ -205,3 +203,9 @@ CREATE TABLE `tblSchedulerTask` (
 UPDATE tblVersion set major=6, minor=0, subminor=0;
 
 COMMIT;
+
+DROP TABLE `old_tblUsers`;
+
+DROP TABLE `old_tblWorkflowLog`;
+
+DROP TABLE `old_tblWorkflowDocumentContent`;