diff --git a/app_ai_bard/models/ai_robot.py b/app_ai_bard/models/ai_robot.py
index effe537c..ae40b039 100644
--- a/app_ai_bard/models/ai_robot.py
+++ b/app_ai_bard/models/ai_robot.py
@@ -17,11 +17,11 @@ class AiRobot(models.Model):
 
     provider = fields.Selection(
         selection_add=[('google', 'Google Ai')],
-        ondelete={'google': 'cascade'}
+        ondelete={'google': 'set default'}
     ),
     set_ai_model = fields.Selection(
         selection_add=[('google-bard', 'Google Bard')],
-        ondelete={'google-bard': 'cascade'})
+        ondelete={'google-bard': 'set default'})
 
     @api.onchange('provider')
     def _onchange_provider(self):
diff --git a/app_chatgpt/models/ai_robot.py b/app_chatgpt/models/ai_robot.py
index f8fdd3f6..f754b0d4 100644
--- a/app_chatgpt/models/ai_robot.py
+++ b/app_chatgpt/models/ai_robot.py
@@ -22,8 +22,7 @@ class AiRobot(models.Model):
     provider = fields.Selection(string="AI Provider", selection=[('openai', 'OpenAI'), ('azure', 'Azure')],
                                 required=True, default='openai', change_default=True)
     # update ai_robot set ai_model=set_ai_model
-    ai_model = fields.Char(string="AI Model", required=True, default='auto', help='Customize input', ondelete=None)
-    
+    ai_model = fields.Char(string="AI Model", required=True, default='auto', help='Customize input')
     set_ai_model = fields.Selection(string="Quick Set Model", selection=[
         ('gpt-3.5-turbo-0613', 'gpt-3.5-turbo-0613(Default and Latest)'),
         ('gpt-3.5-turbo-16k-0613', 'gpt-3.5-turbo-16k-0613(Big text)'),