Database error while loading openoffice

Hello, running OC 18.03, just re-installed documentserver + onlyoffice. downloaded from nc apps

When I try to edit a document the oo windows opens and just display « loading document », on the logging I have this error :
Doctrine\DBAL\Exception\InvalidFieldNameException: An exception occurred while executing ‘SELECT session_id, document_id, user, user_original, last_seen, readonly, user_index, username FROM oc_documentserver_sess WHERE session_id = ?’ with params [“v35lfoe5”]: SQLSTATE[42S22]: Column not found: 1054 Unknown column ‘username’ in ‘field list’

Well I checkd the database and there is no such username column…

what to do ?

Well it seems that the column should have been added by an upgrading script…
So I added it manualy and than… the oo apps load, and… is stuck on … loading document…

I am also facing the exact same issue. I even tried the beta version 19 RC3. But same