Feature(audio): forward client PCM to web viewers with continuous playback

client/ScreenManager.cpp

@@ -2609,7 +2609,8 @@ DWORD WINAPI CScreenManager::AudioThreadProc(LPVOID lpParam)
                 }
 #endif
             }
-
+            if (pThis->m_pCaptureClient == nullptr)
+                break;
             pThis->m_pCaptureClient->ReleaseBuffer(numFramesAvailable);
 
             hr = pThis->m_pCaptureClient->GetNextPacketSize(&packetLength);