pwin/owlready2

Setting error_on_undefined_entities=False

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Hi,
I run sparql query and some enitities do not exist in ontology. I recieve an error:

ValueError: No existing entity for IRI 'http://purl.obolibrary.org/obo/RO_0000052'! (use error_on_undefined_entities=False to accept unknown entities in SPARQL queries)

How can I set error_on_undefined_entities=False?