Query the full graph as subgraph

[FcarrilloBre17]

I'm currently using part of your code to find communities in a kg, but with a subgraph from a query I don't retrieve all data that I want.

I want to use all the graph, using the query
query_ttl = """
prefix dct:http://purl.org/dc/terms/
SELECT ?subject ?p ?object
WHERE {
?subject ?p ?object.
}
"""
and the subgraph is fine, but when I want to build the ig_graph, there is an error, which is:
InternalError: Error at src/graph/type_indexededgelist.c:261: Out-of-range vertex IDs when adding edges. -- Invalid vertex ID

Can somebody help me?
Thanks

[csaparna]

I did encounter the same error while trying to use an rdf file in ttl format to read in as ig_graph. However, It was successful in creating a networkx graph. I used a similar query as above:

query = """
SELECT ?subject ?object
WHERE {
    ?subject ?p ?object .
}
"""

to query for the entire graph.