diff --git a/plugins/opcua/open62541_client.c b/plugins/opcua/open62541_client.c
index d40c4cc3..2dfc19de 100644
--- a/plugins/opcua/open62541_client.c
+++ b/plugins/opcua/open62541_client.c
@@ -328,10 +328,13 @@ int open62541_client_read(open62541_client_t *client, vector_t *datas)
         opcua_data_t *data = (opcua_data_t *) iterator_get(&iter);
         if (!read_response.results[count].hasValue) {
             data->error = -1;
+            count++;
             continue;
         }
+
         if (!UA_Variant_isScalar(&read_response.results[count].value)) {
             data->error = -2;
+            count++;
             continue;
         }
 
diff --git a/plugins/opcua/plugin_opcua.c b/plugins/opcua/plugin_opcua.c
index 4e18fa7a..77d1f2af 100644
--- a/plugins/opcua/plugin_opcua.c
+++ b/plugins/opcua/plugin_opcua.c
@@ -86,8 +86,7 @@ static int opcua_plugin_init(neu_plugin_t *plugin)
     memset(plugin->handle_context, 0, sizeof(opc_handle_context_t));
     plugin->handle_context->plugin       = plugin;
     plugin->handle_context->table        = NULL;
-    plugin->handle_context->self_node_id = neu_plugin_self_node_id(plugin);
-
+    plugin->handle_context->self_node_id = 0;
     NEU_LIST_INIT(&plugin->handle_context->subscribe_list,
                   opc_subscribe_tuple_t, node);
 
@@ -99,7 +98,7 @@ static int opcua_plugin_init(neu_plugin_t *plugin)
         plugin->handle_context->client = NULL;
         return -1;
     } else {
-        log_info("Connected to opc.tcp://%s:%d", plugin->option.host,
+        log_info("Connected to opc.tcp://%s:%s", plugin->option.host,
                  plugin->option.port);
         plugin->handle_context->client = plugin->client;
     }
@@ -157,6 +156,10 @@ static int opcua_plugin_request(neu_plugin_t *plugin, neu_request_t *req)
         return -2;
     }
 
+    if (0 == plugin->handle_context->self_node_id) {
+        plugin->handle_context->self_node_id = neu_plugin_self_node_id(plugin);
+    }
+
     if (NULL == plugin->handle_context->table) {
         plugin->handle_context->table = neu_system_get_datatags_table(
             plugin, plugin->handle_context->self_node_id);