Problem with playing audio in real time using OpenSL ES, Crash APP

I'm trying to record audio and play it in real time using OpenSL ES, I can send the audio packet to the server, and the server is sending the packet to users correctly. However, there is a problem that I don't know why. The user who is recording can hear himself (the audio goes through the server and goes back to him), but when another user is speaking, the audio packages arrive and when I will queue the application closes. Here is the part where I play the audio packets that arrive from the server. void setBuffer(int playerid, uint8_t* buffer, size_t bufferSize) { if (buffer != NULL && playerBufferQueueItf != NULL && playerPlay != NULL && engineEngine != NULL) { (*playerBufferQueueItf)->Enqueue(playerBufferQueueItf, buffer, bufferSize); } } Below starts the listen createEngine(); // Create a mixer SLresult result; result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObjext, 0, 0, 0); assert(SL_RESULT_SUCCESS == result); (void)result; result = (*outputMixObjext)->Realize(outputMixObjext, SL_BOOLEAN_FALSE); assert(SL_RESULT_SUCCESS == result); (void)result; // Create a player createAudioPlayer(engineEngine, outputMixObjext, playerObject); result = (*playerObject)->Realize(playerObject, SL_BOOLEAN_FALSE); assert(SL_RESULT_SUCCESS == result); (void)result; result = (*playerObject)->GetInterface(playerObject, SL_IID_BUFFERQUEUE, &playerBufferQueueItf); assert(SL_RESULT_SUCCESS == result); (void)result; result = (*playerObject)->GetInterface(playerObject, SL_IID_PLAY, &playerPlay); assert(SL_RESULT_SUCCESS == result); (void)result; result = (*playerPlay)->SetPlayState(playerPlay, SL_PLAYSTATE_PLAYING); assert(SL_RESULT_SUCCESS == result); I took this link as a base [login to view URL], it writes to a file and reproduces, my record sends to the server and reproduces in real time. (does not store anything in the file)