Internal member object of static object is getting null in multi threading

I am analysing a crash dump and the crash dump is pointing here. semFile is a static oject and dp is internal object of semFile. This is happening in a multi threaded environment.

void cSemaphore::request (void)
{
    dp->reqcnt++; // -----------------------------------------------------> crash dump points here
}

class dSemaphore
{
public:
    CRITICAL_SECTION cs;        // Windows critical section object
    long    threadid;       // owning thread id
    int reqcnt;         // current request count
    int owncnt;         // current ownership count
    long    totreqs;        // total request count
};

cSemaphore::cSemaphore(void)
{
    dp = new dSemaphore;                // allocate data object
    InitializeCriticalSection(&dp->cs);     // init critical section
    dp->reqcnt = 0;
    dp->owncnt = 0;
    dp->totreqs = 0;
    dp->threadid = 0;
}

Calling function:

// Multiple thread call this function
static unsigned Prefetcher (void *parm)
{
...
    static cSemaphore semFile;
    semFile.request();
...
}

Under which scenario this can happen? I replace it with mutex and same issue is happening. Is this some data race condition ?