diff --git a/addons/event/models/event_event.py b/addons/event/models/event_event.py
index bf8803c0680..ebef7dca4aa 100644
--- a/addons/event/models/event_event.py
+++ b/addons/event/models/event_event.py
@@ -88,8 +88,7 @@ class EventEvent(models.Model):
     _order = 'date_begin'
 
     def _get_default_stage_id(self):
-        event_stages = self.env['event.stage'].search([])
-        return event_stages[0] if event_stages else False
+        return self.env['event.stage'].search([], limit=1)
 
     def _default_description(self):
         return self.env['ir.ui.view']._render_template('event.event_default_descripton')
@@ -574,9 +573,9 @@ class EventEvent(models.Model):
         into the first next (by sequence) stage defined as "Ended"
         (if they are not already in an ended stage)
         """
-        first_ended_stage = self.env['event.stage'].search([('pipe_end', '=', True)], order='sequence')
+        first_ended_stage = self.env['event.stage'].search([('pipe_end', '=', True)], limit=1, order='sequence')
         if first_ended_stage:
-            self.write({'stage_id': first_ended_stage[0].id})
+            self.write({'stage_id': first_ended_stage.id})
 
     def mail_attendees(self, template_id, force_send=False, filter_func=lambda self: self.state != 'cancel'):
         for event in self:
diff --git a/addons/event_crm/models/event_lead_rule.py b/addons/event_crm/models/event_lead_rule.py
index 0c96bd1e21e..8dbaa4d8eeb 100644
--- a/addons/event_crm/models/event_lead_rule.py
+++ b/addons/event_crm/models/event_lead_rule.py
@@ -5,7 +5,6 @@ from ast import literal_eval
 from collections import defaultdict
 
 from odoo import fields, models, _
-from odoo.osv import expression
 
 
 class EventLeadRule(models.Model):
@@ -205,10 +204,7 @@ class EventLeadRule(models.Model):
         """
         self.ensure_one()
         if self.event_registration_filter and self.event_registration_filter != '[]':
-            registrations = registrations.search(expression.AND([
-                [('id', 'in', registrations.ids)],
-                literal_eval(self.event_registration_filter)
-            ]))
+            registrations = registrations.filtered_domain(literal_eval(self.event_registration_filter))
 
         # check from direct m2o to linked m2o / o2m to filter first without inner search
         company_ok = lambda registration: registration.company_id == self.company_id if self.company_id else True