Hi Neli P. Zlatareva, I think this may be fixed in zazuko/yasgui in https://github.com/rdfjs/Yasgui/commit/ceb6338d2f6f9dd71ef2cf1010dc31697f455509 in 4.6.2 ( 4.6.1 is used for both 6.1 and 6.2). Currently, the main branch for Jena uses 4.6.2, but I haven't confirmed and checked if it works.
Best regards, Øyvind Gjesdal On Wed, Oct 14, 2026 at 4:10 PM Zlatareva, Neli (Computer Science) via users <[email protected]> wrote: > Hi there, I am trying to runa valid SPARQL ASK query and Fuseki browser > query interface appears to fail when displaying the result. I have > reproduced the issue with both Apache Jena Fuseki 6.1.0 and 6.2.0 on > Windows. For example: > > ASK { > ?s ?p ?o . > } > > When the query is executed in the Fuseki browser query interface, the > following JavaScript error is displayed: > > Cannot read properties of undefined (reading 'bindings') > > No Boolean result is shown. > The query should return a Boolean result: > > * > true if the graph contains at least one triple; > * > false if the graph is empty. > > Verification > The query itself executes correctly outside the Fuseki browser result > renderer. > When the Fuseki query endpoint is accessed directly with: > > Accept: application/sparql-results+json > > it returns a valid SPARQL Boolean response, for example: > > { > "head": {}, > "boolean": true > } > > The same ASK query also executes correctly using the Jena/ARQ command-line > query tool, where the Boolean result is displayed as yes or no. > I would greatly appreciate any advice on the issue. > Thank you. > Regards, Neli. > > Neli P. Zlatareva, Ph.D. > > Professor of Computer Science > > Central Connecticut State University, > > 1615 New Britain, CT 06050. > > www.cs.ccsu.edu/~neli > > >
