Cannot process query

[Antonis Troumpoukis]

The query is:

PREFIX geo: <http://www.opengis.net/ont/geosparql#>
PREFIX geof: <http://www.opengis.net/def/function/geosparql/>
PREFIX uom: <http://www.opengis.net/def/uom/OGC/1.0/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX fs: <http://earthanalytics.eu/fs/ontology/>

SELECT ?wkt1 ?dist
WHERE {
  ?field fs:hasCropTypeName "MAIZE"^^<http://www.w3.org/2001/XMLSchema#string> .
  ?field fs:hasArea ?area .
  ?field geo:hasGeometry ?geo1 .
  ?geo1 geo:asWKT ?wkt1 .

  ?snowCover rdf:type fs:FoodSecurityObservation .
  ?snowCover fs:hasDN ?dn .
  ?snowCover fs:hasRECDATE "2018-03-10T00:00:00"^^<http://www.w3.org/2001/XMLSchema#dateTime> .
  ?snowCover geo:hasGeometry ?geo2 .
  ?geo2 geo:asWKT ?wkt2 .

  FILTER (?dn > 80) .

  BIND(geof:distance(?wkt1, ?wkt2, uom:metre) as ?dist).

  FILTER(geof:sfIntersects(?wkt1, "POLYGON ((14.69 48.115, 14.69 48.15, 14.78 48.15, 14.78 48.115, 14.69 48.115))"^^geo:wktLiteral))
  FILTER(geof:sfIntersects(?wkt2, "POLYGON ((14.69 48.115, 14.69 48.15, 14.78 48.15, 14.78 48.115, 14.69 48.115))"^^geo:wktLiteral))

  FILTER (?dist < 50000) .
}

and the endpoint is http://143.233.226.33:8087/SemaGrow/sparql
The problem is that the contents of ?dist variable are not displayed.