I think it's a misprint
spriter/CCSpriterKey.cpp
CCSpriterTimelineVisualKey* CCSpriterTimelineVisualKey::create(XMLNode* node, int& index)
{
...
if (objectElement->QueryFloatAttribute("pivot_y", &floatValue) == XML_SUCCESS)
key->m_vecPivot.y = floatValue;
else
key->m_vecPivot.x = -9000.0f; // <--------------- line 206
}