When I do a query as follows
{{#sparql: PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX gemma:<http://model.i-catalogus.nl/gemma/> PREFIX foaf:<http://xmlns.com/foaf/0.1/> PREFIX purl:<http://purl.org/dc/terms/> SELECT ?Softwareproduct ?Naam ?Homepage ?WordtGeleverdDoor ?HomePageLeverancier ?Beschrijving WHERE { ?Softwareproduct rdf:type gemma:SoftwareProduct . ?Softwareproduct rdfs:label ?Naam . ?Softwareproduct foaf:homepage ?Homepage . ?Softwareproduct gemma:wordtGeleverdDoor ?Leverancier . ?Leverancier rdfs:label ?WordtGeleverdDoor . ?Leverancier foaf:homepage ?HomePageLeverancier . ?Softwareproduct purl:description ?Beschrijving } |endpoint=http://sparql.i-catalogus.nl/|headers=Softwareproduct, Geleverd door, Beschrijving|templates=ToonSoftwareproduct, ToonGeleverdDoor,ToonSoftwareproductBeschrijving}}
I get a notice like:
Notice: Undefined index: Beschrijving in /var/www/wikifarm-mw1.19/extensions/LinkedWiki/LinkedWiki.php on line 283
This has probably something to do with empty values. If more cells are empty then the notice is repeated.