diff --git a/wizard/scop_membership_out_wizard.py b/wizard/scop_membership_out_wizard.py
index 0ef03db691f3cc2761e3fdeb8a6491112c3623fb..b1d496dec61bc18b3feb20f0a8a1efe8917b6946 100644
--- a/wizard/scop_membership_out_wizard.py
+++ b/wizard/scop_membership_out_wizard.py
@@ -33,9 +33,10 @@ class ScopMembershipOutWizard(models.TransientModel):
         # Close previous period
         for period in self:
             last_period = self.env['scop.membership.period'].search(
-                [('partner_id', '=', period.partner_id),
+                [('partner_id', '=', period.partner_id.id),
                  ('end', '=', False), ('type_id', '=', period.type_id.id)],
                 limit=1)
+
             if last_period:
                 if period.end >= last_period.start:
                     last_period.write({