About: http://webisa.webdatacommons.org/352912978

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	I assume the former, in which case if you can not reliably reproduce this it will be pretty tricky to debug, especially since you do not have a good stack trace to pinpoint the source.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com