Issue with High Limit Queries on ISSA SPARQL Endpoint in Muvin Visualization

[Niteuk]

### Problem:
When querying the ISSA SPARQL endpoint "https://data-issa.cirad.fr/sparql" with the following query and using the value "CIRAD - FRA", the visualization in Muvin works correctly with a limit of 100 in the query. However, increasing the limit to 500 or more results in a SyntaxError: Unexpected end of JSON input error.

### Query:

PREFIX fabio: <http://purl.org/spar/fabio/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX bibo: <http://purl.org/ontology/bibo/>
PREFIX issa: <http://data-issa.cirad.fr/>
PREFIX issapr: <http://data-issa.cirad.fr/property/>
PREFIX oa: <http://www.w3.org/ns/oa#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dct: <http://purl.org/dc/terms/>
PREFIX schema: <http://schema.org/>
PREFIX dce: <http://purl.org/dc/elements/1.1/>
PREFIX fabio: <http://purl.org/spar/fabio/>

SELECT DISTINCT ?uri ?title ?date ?type ?link ?ego ?alter
WHERE {
    BIND ("$value" AS ?ego)

    {
        ?uri dce:creator ?ego .
    }

    OPTIONAL {
        ?uri dce:creator ?alter .
        FILTER (?alter != ?ego) 
    }

    ?uri dct:title ?title ;
         dct:issued ?date ;
         schema:url ?link ;
         a ?documentType .

    # Déterminer le type de document
    BIND (IF (?documentType = fabio:ResearchPaper, "Article",
              IF (?documentType = fabio:Expression, "Monograph",
                  IF (?documentType = fabio:StillImage, "Map",
                      IF (?documentType = fabio:Book, "Book",
                          IF (?documentType = fabio:BookChapter, "Book Section",
                              IF (?documentType = fabio:ConferencePaper, "Conference Article", "Other")))))) AS ?type)
} LIMIT 500 OFFSET $offset

### Console Output on Muvin:

TypeError: Cannot read properties of undefined (reading 'value')
    at C:\Users\quent\Desktop\Master_2\Stage\muvin\datatools\transform.js:92:52
    at Array.map (<anonymous>)
    at C:\Users\quent\Desktop\Master_2\Stage\muvin\datatools\transform.js:92:35
    at Array.map (<anonymous>)
    at Transform.clean (C:\Users\quent\Desktop\Master_2\Stage\muvin\datatools\transform.js:88:36)
    at Transform.getData (C:\Users\quent\Desktop\Master_2\Stage\muvin\datatools\transform.js:201:20)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async C:\Users\quent\Desktop\Master_2\Stage\muvin\server.js:100:22