PVS-Studio warning V503 for OGDF

int Hierarchy::calculateCrossingsPlaneSweep(int i)
{
  const Level *pLevel[2];
  pLevel[0] = m_pLevel[i]; pLevel[1] = m_pLevel[i+1];
  if (pLevel[0]->high() <= 0 || pLevel[1] <= 0) return 0;
  ....
}

This suspicious code was found in OGDF project by PVS-Studio static code analyzer.
Warning message is:
V503 This is a nonsensical comparison: pointer <= 0. sugiyama.cpp 571

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