In the user preference, change the timezone of the user to blank (False value) Save Before this commit, a cryptic error was raised because the field tz in resource.resource is required Note that when writing on res.user, we write some fields (including tz) on hr.employee, which is a resource.mixin, and therefore uses resource.resource After this commit, we make the field required in the view OPW 1934462 closes odoo/odoo#31312