diff --git a/src/main/java/com/tongran/agent/client/service/impl/SwitchBoardServiceImpl.java b/src/main/java/com/tongran/agent/client/service/impl/SwitchBoardServiceImpl.java
index d9cae21..cdcc401 100644
--- a/src/main/java/com/tongran/agent/client/service/impl/SwitchBoardServiceImpl.java
+++ b/src/main/java/com/tongran/agent/client/service/impl/SwitchBoardServiceImpl.java
@@ -429,6 +429,9 @@ public class SwitchBoardServiceImpl implements SwitchBoardService {
 ////                "1.3.6.1.2.1.2.2.1.10", // ifInOctets
 ////                "1.3.6.1.2.1.2.2.1.16"  // ifOutOctets
 //        };
+        if(ifOIDs == null || ifOIDs.length == 0){
+            return "";
+        }
         for (int i = 1; i <= ifNumber; i++) {
             pdu = new PDU();
             for (String baseOID : ifOIDs) {