'Have no results SPARQL in Protege

I have a problem with my syntax I guess I tried to fetch data from dbpedia by using SPARQL query in Protege 5.5

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX museum: <http://www.menthor.net/myontology#>
PREFIX dbp: <https://dbpedia.org/ontology/>
PREFIX p: <http://mappings.dbpedia.org/server/ontology/classes/Museum/>


SELECT ?h
WHERE {
  ?h a p:collection .
  ?h rdfs:domain ?Museum .
 }
    LIMIT 5

I have an epmty result, there are no logs, no errors What do I wrong? How can I fix/rewrite it?

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'Have no results SPARQL in Protege

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