diff --git a/server/wsproxy/jsondatamgr.cc b/server/wsproxy/jsondatamgr.cc
index 7b124f6..a5a3990 100644
--- a/server/wsproxy/jsondatamgr.cc
+++ b/server/wsproxy/jsondatamgr.cc
@@ -67,8 +67,9 @@ void JsonDataMgr::Init()
     routing_tables_json_.ReadFromFile(routing_tables_json_file);
     node_host_mutex_->lock();
     for (int i = 0; i < routing_tables_json_.Size(); ++i) {
-        int node_id = routing_tables_json_.At("node_id")->AsXValue();
-        std::string host = routing_tables_json_.At("host")->AsXValue();
+        auto node_conf = routing_tables_json_.At(i);
+        int node_id = node_conf->At("node_id")->AsXValue();
+        std::string host = node_conf->At("host")->AsXValue();
         if (node_host_hash_.find(node_id) != node_host_hash_.end()) {
             abort();
         }