I updated my site to Osclass 8.1.1 and now I can't install themes and plugins. When I try to install WhasApp chat plugin I get the error below:

Plugin couldn't be installed because of: Error importSQL::ModelWAC
wa_chat/model/struct.sql
1005 - Can't create table `u172359719_osclass`.`oc_t_wac_item` (errno: 150 "Foreign key constraint is incorrectly formed")

My website is at: https://pampaso.com

Create support ticket with all details (db, ocadmin logins).
This often happen on MariaDB in latest version I think.