diff --git a/cap/zx297520v3/src/lynq/lib/liblynq-qser-data/lynq-qser-data.cpp b/cap/zx297520v3/src/lynq/lib/liblynq-qser-data/lynq-qser-data.cpp
index b5b2f6c..85767bc 100755
--- a/cap/zx297520v3/src/lynq/lib/liblynq-qser-data/lynq-qser-data.cpp
+++ b/cap/zx297520v3/src/lynq/lib/liblynq-qser-data/lynq-qser-data.cpp
@@ -411,6 +411,11 @@
             sum_node = sum_node->next;
             continue;
         }
+        else if(strcmp((char *)xmlGetProp(sum_node, "apn_type"), apn->apn_type) == 0)
+        {
+            LYERRLOG("apntype already exists\n");
+            goto FAILED;
+        }
         node_num++;
         sum_node = sum_node->next;
     }