Application Express :: Update Values When Logout

I want to make DML process when the user logout :-i do the following steps :-1-I change the url &LOGOUT_URL to another page not the login page like 10  , as wwv_flow_custom_auth_std.logout?p_this_flow=&APP_ID.&p_next_flow_page_sess=&APP_ID.:102- Make tow process in the pageone (on-load before header) to do dml code like this

BEGIN
UPDATE SYS_USERS
SET ACTION_STATUS = 2
where upper(:p101_username)  like upper(USER_NAME);
commit;
END;and another process after header
apex_application.g_unrecoverable_error := true;
wwv_flow_custom_auth_std.logout(
p_this_flow => :APP_ID,
p_next_flow_page_sess => :APP_ID ||':101'
); 

to go to the login pagebut the dml code not executeand when try to login again i have this errorContent-type: text/html; charset=UTF-8 Content-type: text/html; charset=UTF-8 Set-Cookie: ORA_WWV_APP_100=-1; HttpOnly Location: /apex/f?p=100:101