What is wrong with this tiny piece of mutex code

// A Mutex allows threads mutually exclusive access to a resource.
//-----------------------------------------------------------------------

class Mutex
{
private:
    CRITICAL_SECTION m_mutex;

public:
     Mutex() { InitializeCriticalSection(&m_mutex); }
    ~Mutex() { DeleteCriticalSection(&m_mutex);     }

    void acquire() { EnterCriticalSection(&m_mutex); }
    void release() { LeaveCriticalSection(&m_mutex); }
};

InitializeCriticalSection Error: lpCriticalSection (0x000387d4) points to an invalid
  memory location (0x00018984) Mutex::Mutex in lockmutex.h, line 29

struct Customer {
    char * name;
};

extern void greetCustomer(Customer* c);

class CheckoutLine {
  private:
    Customer m_customer;
  public CheckoutLine() {
    greetCustomer(&m_customer);
  }
};