diff --git a/sql/mysql/upgrade/3.5.3/doc_checked_out_user_id.sql b/sql/mysql/upgrade/3.5.3/doc_checked_out_user_id.sql
new file mode 100644
index 0000000..06eb833
--- /dev/null
+++ b/sql/mysql/upgrade/3.5.3/doc_checked_out_user_id.sql
@@ -0,0 +1,2 @@
+update documents set checked_out_user_id=null
+WHERE checked_out_user_id=-10 and is_checked_out=0;
\ No newline at end of file