RTPSession failed null

i'm using your ccRTP and get some code from example audiotx.cpp.
I have some problem and no idea how to resolve it. In the code below :

class ccRTP_AudioTransmitter: public Thread, public TimerPort
{
...........................
   RTPSession *socket;
public:
  .............................
   // This method does almost everything.
   void run(void)
{
...........................................             // Construct the RTP
socket.
       socket = new RTPSession(local_ip,TRANSMITTER_BASE);

var socket returns NULL in debug mode and after first use we have SIGSEGV
error. But in release mode this code works correctly

Please, help me understand this error. 
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