diff --git a/doric-Qt/example/doric/plugin/DoricShaderPlugin.cpp b/doric-Qt/example/doric/plugin/DoricShaderPlugin.cpp
index 6da90c9e..2c7648a6 100644
--- a/doric-Qt/example/doric/plugin/DoricShaderPlugin.cpp
+++ b/doric-Qt/example/doric/plugin/DoricShaderPlugin.cpp
@@ -34,3 +34,7 @@ void DoricShaderPlugin::render(QString jsValueString, QString callbackId) {
       },
       DoricThreadMode::UI);
 }
+
+void DoricShaderPlugin::command(QString jsValueString, QString callbackId) {
+  qCritical() << "command: " << jsValueString << " " << callbackId;
+}
diff --git a/doric-Qt/example/doric/plugin/DoricShaderPlugin.h b/doric-Qt/example/doric/plugin/DoricShaderPlugin.h
index c7186135..474f5a8c 100644
--- a/doric-Qt/example/doric/plugin/DoricShaderPlugin.h
+++ b/doric-Qt/example/doric/plugin/DoricShaderPlugin.h
@@ -11,6 +11,8 @@ public:
   using DoricNativePlugin::DoricNativePlugin;
 
   Q_INVOKABLE void render(QString jsValueString, QString callbackId);
+
+  Q_INVOKABLE void command(QString jsValueString, QString callbackId);
 };
 
 #endif // SHADERPLUGIN_H
diff --git a/doric-Qt/example/doric/shader/slider/DoricSliderNode.cpp b/doric-Qt/example/doric/shader/slider/DoricSliderNode.cpp
index 93901f9f..d076206c 100644
--- a/doric-Qt/example/doric/shader/slider/DoricSliderNode.cpp
+++ b/doric-Qt/example/doric/shader/slider/DoricSliderNode.cpp
@@ -25,6 +25,7 @@ DoricViewNode *DoricSliderNode::getSubNodeById(QString id) {
       return childNodes.at(i);
     }
   }
+  return nullptr;
 }
 
 void DoricSliderNode::blendSubNode(QJsonValue subProperties) {