diff --git a/api/controllers/console/workspace/trigger_providers.py b/api/controllers/console/workspace/trigger_providers.py
index 8afec9a94d..631b82979b 100644
--- a/api/controllers/console/workspace/trigger_providers.py
+++ b/api/controllers/console/workspace/trigger_providers.py
@@ -8,6 +8,7 @@ from werkzeug.exceptions import BadRequest, Forbidden
 from configs import dify_config
 from controllers.console import api
 from controllers.console.wraps import account_initialization_required, setup_required
+from controllers.web.error import NotFoundError
 from core.model_runtime.utils.encoders import jsonable_encoder
 from core.plugin.entities.plugin_daemon import CredentialType
 from core.plugin.impl.oauth import OAuthHandler
@@ -318,7 +319,7 @@ class TriggerOAuthAuthorizeApi(Resource):
             )
 
             if oauth_client_params is None:
-                raise Forbidden("No OAuth client configuration found for this trigger provider")
+                raise NotFoundError("No OAuth client configuration found for this trigger provider")
 
             # Create subscription builder
             subscription_builder = TriggerSubscriptionBuilderService.create_trigger_subscription_builder(
diff --git a/api/services/trigger/trigger_provider_service.py b/api/services/trigger/trigger_provider_service.py
index 5b6b18c37b..4cc19b485a 100644
--- a/api/services/trigger/trigger_provider_service.py
+++ b/api/services/trigger/trigger_provider_service.py
@@ -336,7 +336,7 @@ class TriggerProviderService:
 
             # Update credentials
             subscription.credentials = dict(encrypter.encrypt(dict(refreshed_credentials.credentials)))
-            subscription.expires_at = refreshed_credentials.expires_at
+            subscription.credential_expires_at = refreshed_credentials.expires_at
             session.commit()
 
             # Clear cache
@@ -448,7 +448,9 @@ class TriggerProviderService:
                 session.add(custom_client)
 
             # Update client params if provided
-            if client_params is not None:
+            if client_params is None:
+                custom_client.encrypted_oauth_params = json.dumps({})
+            else:
                 encrypter, cache = create_provider_encrypter(
                     tenant_id=tenant_id,
                     config=[x.to_basic_provider_config() for x in provider_controller.get_oauth_client_schema()],