Segfault on IterateChildren() and NextSiblingElement() calls

Question

I'm trying to loop through elements in an HTML document, and pretty much copied and pasted the code from the TinyXML documentation, but this segfaults after it has gone through every child.

std::string html = "<TABLE><TR></TR><TR></TR><TR></TR></TABLE>";
TiXmlDocument doc;
doc.Parse(html.c_str(), 0, TIXML_ENCODING_UTF8);
TiXmlNode *entry = 0;
while (entry = doc.FirstChildElement("TABLE")->IterateChildren(entry))
{                    
    std::cout<<entry<<std::endl;
}

Here's an example of the output:

0x1a2b190
0x1a2b290
0x1a2b360
Segmentation fault (core dumped)

The same thing happens if I loop using NextSiblingElement() instead of IterateChildren(). Why isn't this working?