diff --git a/monitor/nacos.py b/monitor/nacos.py
index d84cd04..eccdb68 100644
--- a/monitor/nacos.py
+++ b/monitor/nacos.py
@@ -330,19 +330,26 @@ def list_instances(namespace_id: str, service_name: str, group_name: str) -> lis
 
 
 def catalog_instances(namespace_id: str, service_name: str, group_name: str) -> list[dict[str, Any]]:
-    # 调用 catalog/instances 获取注册表视图。
-    payload = nacos_request(
-        "GET",
-        "/nacos/v1/ns/catalog/instances",
-        {
-            "serviceName": service_name,
-            "groupName": group_name,
-            "namespaceId": namespace_id or None,
-            "clusterName": NACOS_DISCOVERY_CLUSTER_NAME,
-            "pageNo": "1",
-            "pageSize": str(max(NACOS_PAGE_SIZE, 200)),
-        },
-    )
+    try:
+        # 调用 catalog/instances 获取注册表视图。
+        payload = nacos_request(
+            "GET",
+            "/nacos/v1/ns/catalog/instances",
+            {
+                "serviceName": service_name,
+                "groupName": group_name,
+                "namespaceId": namespace_id or None,
+                "clusterName": NACOS_DISCOVERY_CLUSTER_NAME,
+                "pageNo": "1",
+                "pageSize": str(max(NACOS_PAGE_SIZE, 200)),
+            },
+        )
+    except RuntimeError as exc:
+        # 服务不存在时按空列表处理，不让单服务失败拖垮整块 Nacos 面板。
+        message = str(exc).lower()
+        if "is not found" in message or "service " in message and "not found" in message:
+            return []
+        raise
 
     # 返回 list 字段。
     return list(payload.get("list") or [])