diff --git a/api/controllers/console/workspace/trigger_providers.py b/api/controllers/console/workspace/trigger_providers.py
index 6eab1daca3..3f1f6149c7 100644
--- a/api/controllers/console/workspace/trigger_providers.py
+++ b/api/controllers/console/workspace/trigger_providers.py
@@ -45,7 +45,7 @@ class TriggerSubscriptionUpdateRequest(BaseModel):
 class SubscriptionRebuildRequest(BaseModel):
     """Request payload for rebuilding an existing subscription."""
 
-    credentials: Mapping[str, Any] = Field(default_factory=dict, description="The credentials for the subscription")
+    credentials: Mapping[str, Any] | None = Field(default=None, description="The credentials for the subscription")
     parameters: Mapping[str, Any] = Field(default_factory=dict, description="The parameters for the subscription")
 
 
@@ -423,7 +423,7 @@ class TriggerSubscriptionRebuildApi(Resource):
                 tenant_id=user.current_tenant_id,
                 provider_id=TriggerProviderID(provider),
                 subscription_id=subscription_id,
-                credentials=rebuild_request.credentials,
+                credentials=rebuild_request.credentials or {},
                 parameters=rebuild_request.parameters,
             )
 
diff --git a/api/services/trigger/trigger_provider_service.py b/api/services/trigger/trigger_provider_service.py
index 9fa3386e5e..6aa46b89fe 100644
--- a/api/services/trigger/trigger_provider_service.py
+++ b/api/services/trigger/trigger_provider_service.py
@@ -857,7 +857,7 @@ class TriggerProviderService:
             provider_id=provider_id,
             endpoint=generate_plugin_trigger_endpoint_url(subscription.endpoint_id),
             parameters=parameters,
-            credentials=credentials,
+            credentials=credentials or subscription.credentials,
             credential_type=credential_type,
         )
         TriggerProviderService.update_trigger_subscription(