In GraphQL query Filter not able to fiter with Entity reference value

I have created Course Type Entity reference . now I want search with title course type filter.
title filter working fine but course type showing internal server error.
{
nodeQuery(filter: {
conditions: [
{ field: "title", value: "%Diploma%", operator: LIKE },
{ field: "fieldCourseType.entity.entityLabel", value: "graduate", operator: LIKE }

]
}) {
entities {
... on NodeCourses {
title
body {
value
}
fieldCourseType {
entity {
entityId
entityLabel
}
}
}
}
}
}