diff --git a/services/audiomanager/managersource/src/daudio_source_dev.cpp b/services/audiomanager/managersource/src/daudio_source_dev.cpp
index 7ffc2a94623a1b06cae9b0f81d1c21970140169f..338c1ba75b37250ded846d76acfaeb943babc34b 100644
--- a/services/audiomanager/managersource/src/daudio_source_dev.cpp
+++ b/services/audiomanager/managersource/src/daudio_source_dev.cpp
@@ -745,12 +745,13 @@ int32_t DAudioSourceDev::TaskDisableDAudio(const std::string &args)
     if (args.length() > DAUDIO_MAX_JSON_LEN || args.empty()) {
         return ERR_DH_AUDIO_SA_PARAM_INVALID;
     }
-    cJSON *jParam = cJSON_Parse(args.c_str());
-    CHECK_NULL_RETURN(jParam, ERR_DH_AUDIO_NULLPTR);
+
     int32_t dhId = ParseDhidFromEvent(args);
-    CHECK_AND_FREE_RETURN_RET_LOG(dhId == ERR_DH_AUDIO_FAILED, ERR_DH_AUDIO_NULLPTR, jParam,
-        "%{public}s", "Parse dhId error.");
-    cJSON_Delete(jParam);
+    if (dhId == ERR_DH_AUDIO_FAILED) {
+        DHLOGE("Parse dhId error. hdId: %{public}d.", dhId);
+        return ERR_DH_AUDIO_NULLPTR;
+    }
+    
     DHLOGI("Parsed dhId = %{public}d", dhId);
     switch (GetDevTypeByDHId(dhId)) {
         case AUDIO_DEVICE_TYPE_SPEAKER:
diff --git a/services/test_example/distributedaudiotest.cpp b/services/test_example/distributedaudiotest.cpp
index db1833c98bba72a6655de7f90e98d13d850508d5..98e7689281e58c2a51c3e10919256fa4e515ae4f 100644
--- a/services/test_example/distributedaudiotest.cpp
+++ b/services/test_example/distributedaudiotest.cpp
@@ -288,6 +288,9 @@ static void OpenSpk(const std::string &devId)
     }
 
     g_callbackStub = new AudioParamCallbackImpl();
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->RegExtraParamObserver(g_callbackStub, 0);
     if (ret != DH_SUCCESS) {
         std::cout << "Register observer failed, ret: " << ret << std::endl;
@@ -442,12 +445,18 @@ static void CloseSpk()
         StopRender();
     }
 
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->DestroyRender(g_renderId);
     if (ret != DH_SUCCESS) {
         std::cout << "Close speaker failed" << std::endl;
         return;
     }
     if (g_micStatus == DeviceStatus::DEVICE_IDLE) {
+        if (g_manager == nullptr) {
+            return;
+        }
         g_manager->UnloadAdapter(g_devId);
         g_adapter = nullptr;
     }
@@ -512,6 +521,9 @@ static void OpenMic(const std::string &devId)
     captureAttr.channelCount = CAPTURE_CHANNEL_MASK;
     captureAttr.sampleRate = AUDIO_SAMPLE_RATE;
     captureAttr.format = AudioFormat::AUDIO_FORMAT_TYPE_PCM_16_BIT;
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->CreateCapture(captureDesc, captureAttr, g_capture, g_captureId);
     if (ret != DH_SUCCESS || g_capture == nullptr) {
         std::cout << "Open MIC device failed." << std::endl;
@@ -628,12 +640,18 @@ static void CloseMic()
         StopCapture();
     }
 
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->DestroyCapture(g_captureId);
     if (ret != DH_SUCCESS) {
         std::cout << "Close mic failed." << std::endl;
         return;
     }
     if (g_spkStatus == DeviceStatus::DEVICE_IDLE) {
+        if (g_manager == nullptr) {
+            return;
+        }
         g_manager->UnloadAdapter(g_devId);
         g_adapter = nullptr;
     }
@@ -661,6 +679,9 @@ static void SetVolume()
     AudioExtParamKey key = AudioExtParamKey::AUDIO_EXT_PARAM_KEY_VOLUME;
     std::string condition = "EVENT_TYPE=1;VOLUME_GROUP_ID=1;AUDIO_VOLUME_TYPE=1;";
     std::string volStr = std::to_string(volInt);
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->SetExtraParams(key, condition, volStr);
     if (ret != DH_SUCCESS) {
         std::cout << "Set volume failed" << std::endl;
@@ -676,6 +697,9 @@ static void GetVolume()
     AudioExtParamKey key = AudioExtParamKey::AUDIO_EXT_PARAM_KEY_VOLUME;
     std::string condition = "EVENT_TYPE=1;VOLUME_GROUP_ID=1;AUDIO_VOLUME_TYPE=1;";
     std::string vol;
+    if (g_adapter == nullptr) {
+        return;
+    }
     int32_t ret = g_adapter->GetExtraParams(key, condition.c_str(), vol);
     if (ret != DH_SUCCESS) {
         std::cout << "Get Volume failed." << std::endl;