diff --git a/pkg/runtime/runtime.go b/pkg/runtime/runtime.go
index d295fc1aa7..90da309dd7 100644
--- a/pkg/runtime/runtime.go
+++ b/pkg/runtime/runtime.go
@@ -339,6 +339,9 @@ func (m *MosnRuntime) initPubSubs(factorys ...*runtime_pubsub.Factory) error {
 		// check consumerID
 		consumerID := strings.TrimSpace(config.Metadata["consumerID"])
 		if consumerID == "" {
+			if config.Metadata == nil {
+				config.Metadata = make(map[string]string)
+			}
 			config.Metadata["consumerID"] = m.runtimeConfig.AppManagement.AppId
 		}
 		// init this component with the config
diff --git a/pkg/runtime/runtime_test.go b/pkg/runtime/runtime_test.go
index f4fadb5a44..bab043c1c8 100644
--- a/pkg/runtime/runtime_test.go
+++ b/pkg/runtime/runtime_test.go
@@ -294,6 +294,32 @@ func TestMosnRuntime_initPubSubs(t *testing.T) {
 	})
 }
 
+func TestMosnRuntime_initPubSubsNotExistMetadata(t *testing.T) {
+	t.Run("normal", func(t *testing.T) {
+		// mock pubsub component
+		mockPubSub := mock_pubsub.NewMockPubSub(gomock.NewController(t))
+		mockPubSub.EXPECT().Init(gomock.Any()).Return(nil)
+		f := func() pubsub.PubSub {
+			return mockPubSub
+		}
+
+		cfg := &MosnRuntimeConfig{
+			PubSubManagement: map[string]mpubsub.Config{
+				"mock": {},
+			},
+		}
+		// construct MosnRuntime
+		m := NewMosnRuntime(cfg)
+		m.errInt = func(err error, format string, args ...interface{}) {
+			log.DefaultLogger.Errorf("[runtime] occurs an error: "+err.Error()+", "+format, args...)
+		}
+		// test initPubSubs
+		err := m.initPubSubs(mpubsub.NewFactory("mock", f))
+		// assert result
+		assert.Nil(t, err)
+	})
+}
+
 func TestMosnRuntime_initStates(t *testing.T) {
 	t.Run("init success", func(t *testing.T) {
 		// prepare mock