PVS-Studio warning V571 for MTASA

int CLuaFunctionDefs::XMLNodeGetName ( lua_State* luaVM )
{
  CXMLNode* pNode = NULL;
  CScriptArgReader argStream ( luaVM );
  argStream.ReadUserData ( pNode );

  if ( !argStream.HasErrors ( ) )
  {
    if ( pNode )
    {
      if ( pNode )
      {
        lua_pushstring (
          luaVM, pNode->GetTagName ().c_str () );
        return 1;
      }
    }
  }
  else
    m_pScriptDebugging->LogCustom (
      luaVM, argStream.GetFullErrorMessage() );

  lua_pushboolean ( luaVM, false );
  return 1;
}

This suspicious code was found in MTASA project by PVS-Studio static code analyzer.
Warning message is:
V571 Recurring check. The 'if (pNode)' condition was already verified in line 162. cluafunctiondefs.xml.cpp 164

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