diff --git a/plugins/mqtt/mqtt_plugin_intf.c b/plugins/mqtt/mqtt_plugin_intf.c
index b9fa7fa6..61435a65 100644
--- a/plugins/mqtt/mqtt_plugin_intf.c
+++ b/plugins/mqtt/mqtt_plugin_intf.c
@@ -167,6 +167,7 @@ int mqtt_plugin_uninit(neu_plugin_t *plugin)
 
     mqtt_config_fini(&plugin->config);
     if (plugin->client) {
+        neu_mqtt_client_remove_cache_db(plugin->client);
         neu_mqtt_client_close(plugin->client);
         neu_mqtt_client_free(plugin->client);
         plugin->client = NULL;
@@ -395,6 +396,7 @@ int mqtt_plugin_config(neu_plugin_t *plugin, const char *setting)
     }
 
     if (plugin->client != NULL) {
+        neu_mqtt_client_remove_cache_db(plugin->client);
         neu_mqtt_client_close(plugin->client);
         neu_mqtt_client_free(plugin->client);
     }
diff --git a/plugins/restful/global_config_handle.c b/plugins/restful/global_config_handle.c
index 8681266d..03c67ca8 100644
--- a/plugins/restful/global_config_handle.c
+++ b/plugins/restful/global_config_handle.c
@@ -1798,8 +1798,10 @@ static int add_app_node(context_t *ctx, neu_json_app_t *app)
     neu_req_add_node_t cmd = { 0 };
     strcpy(cmd.node, app->node.name);
     strcpy(cmd.plugin, app->node.plugin);
-    cmd.setting       = app->node.setting;
-    cmd.tags          = strdup(app->node.tags);
+    cmd.setting = app->node.setting;
+    if (app->node.tags != NULL) {
+        cmd.tags = strdup(app->node.tags);
+    }
     app->node.setting = NULL;
 
     if (0 != neu_plugin_op(plugin, header, &cmd)) {
diff --git a/version b/version
index 2ccb7559..35f5a66c 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-2.14.0-beta3
+2.14.0-beta4