Release mode Crash the application

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C++

can any one help me.

UINT  CMyAPI::StartOpenThread(LPVOID lpVoid)
{
	CString strFuncName="MyAPI::StartOpenThread";
	
	CMyAPI *nvr= (MyAPI*)lpVoid;
                nvr->m_lValUID=nvr->someWorkMethod();
	SetEvent(nvr->m_hEvent);
              return 0;
}

long  CMyAPI::APIOpen()
{
	

	long lRet=-1;
	
     if(m_pThread==NULL)
        { 
			
			m_hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
			m_pThread=AfxBeginThread(CmyAPI::StartOpenThread,this);
			int nRet = WaitForSingleObject(m_hEvent,25000);
			ResetEvent(m_hEvent);
	                                CloseHandle(m_hEvent); 
			m_hEvent=NULL;
			m_pThread = NULL;
			lRet=m_lValUID;

                       }
	
		
	return lRet;
}

in MyAPI.h Class i Declare

            long m_lValUID;
      HANDLE m_hEvent;
  CWinThread *m_pThread;
static  UINT StartOpenThread(LPVOID lpVoid);
and initialize on Constructor
        m_lValUID=-1;
	m_pThread=NULL;
	
	m_hEvent=NULL;

the above code working in debug mode but crash in relese mode.Can any one help me.

[edit]Code block added - OriginalGriff[/edit]