PVS-Studio warning V595 for OpenCV

void CvBlobTrackerAuto1::Process(IplImage* pImg, IplImage* pMask)
{
  ....
  CvBlob* pBN = NewBlobList.GetBlob(i);
  pBN->ID = m_NextBlobID;

  if(pBN &&
     pBN->w >= CV_BLOB_MINW &&
     pBN->h >= CV_BLOB_MINH)
  ....
}

This suspicious code was found in OpenCV project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'pBN' pointer was utilized before it was verified against nullptr. Check lines: 432, 434. blobtrackingauto.cpp 432

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/