PVS-Studio warning V595 for Coin3D

SbBool
SoBaseKit::setPart(const int partnum, SoNode * node)
{
  ....
  if (childlist->find(node) >= 0) {
    SoDebugError::postWarning("SoBaseKit::setPart",
      "Node pointer (%p, '%s', '%s') is "
      "already used under the same group node in the catalog "
      "as a child of part '%s' -- this is not allowed",
      node,
      node->getName().getString(),
      node->getTypeId().getName().getString(),
      catalog->getName(parentIdx).getString());
    return FALSE;
  }
  ....
  if (node)
  ....
}

This suspicious code was found in Coin3D project by PVS-Studio static code analyzer.
Warning message is:
V595 The 'node' pointer was utilized before it was verified against nullptr. Check lines: 2397, 2407. sobasekit.cpp 2397

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/