TinyXML2 segfault

xml_parser.cpp

c = content->FirstChildElement("Connection");
while(dialogues[0] != nullptr) // rewrite to iterate to the next dialogue
{
        if(c->FirstChildElement("Source")->Attribute("IdRef", rightTarget.front().c_str()))
	     connectionNodes.push_back(c);
	if(c != nullptr)
	     c = c->NextSiblingElement("Connection");

	if(c == nullptr)
	{

	     FindDialogueChildren(dialogues, connectionNodes, orderedNodes, sourceCount, childTypes);

	     c = content->FirstChildElement("Connection"); // segfault occurs here third time it is hit.
	     while(c != nullptr)
	     {
		   while(c != nullptr && !c->FirstChildElement("Source")->Attribute("IdRef", id.c_str()))
		   {
			c = c->NextSiblingElement("Connection");
		   }

		   if(c != nullptr)
		   {
			connectionNodes.push_back(c);
			c = c->NextSiblingElement("Connection");
		   }
	     }
             c = content->FirstChildElement("Connection');
	}
}