I created https://github.com/apache/jena/issues/3516 and added a possible fix.

A minimal query/data sample would of course be helpful to ensure that this really fixes your issue.

Cheers,

Claus


On 10/17/25 11:42, Gaspar Bartalus wrote:
Hello,

We've been getting the following error from the last 4 releases of
jena-fuseki: (5.3.0 onwards)

Cannot invoke
"org.apache.jena.sparql.engine.join.MultiHashProbeTable.clear()" because
"this.hashTable" is null

The SPARQL query is quite complex and there is a dependency on the RDF data
as well, so for now I don't have any more details, but I'd be curious if
you have any suggestions on what could cause this, or how to fix it.

Thanks,
Gaspar

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