diff --git a/addons/project/models/project.py b/addons/project/models/project.py
index c66b53ceffc..7ac95431aa7 100644
--- a/addons/project/models/project.py
+++ b/addons/project/models/project.py
@@ -388,13 +388,11 @@ class Task(models.Model):
 
     @api.onchange('project_id')
     def _onchange_project(self):
-        default_partner_id = self.env.context.get('default_partner_id')
-        default_partner = self.env['res.partner'].browse(default_partner_id) if default_partner_id else self.env['res.partner']
         if self.project_id:
-            self.partner_id = self.project_id.partner_id or default_partner
+            if self.project_id.partner_id:
+                self.partner_id = self.project_id.partner_id
             self.stage_id = self.stage_find(self.project_id.id, [('fold', '=', False)])
         else:
-            self.partner_id = default_partner
             self.stage_id = False
 
     @api.onchange('user_id')