About: http://webisa.webdatacommons.org/13506339

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Edit @Paul .but your question is essentially saying How do I handle this so I will not get an error when there is an error condition.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com