diff --git a/lib/bolognese/utils.rb b/lib/bolognese/utils.rb
index 3f79670a..acab1cc8 100644
--- a/lib/bolognese/utils.rb
+++ b/lib/bolognese/utils.rb
@@ -882,8 +882,11 @@ def to_schema_org_spatial_coverage(geo_location)
               "@type" => "GeoShape",
               "address" => gl["geoLocationPlace"],
               "polygon" => Array.wrap(gl.dig("geoLocationPolygon")).map do |glp|
-                [glp.dig("polygonPoint", "pointLongitude"), glp.dig("polygonPoint", "pointLatitude")].compact
-              end.compact }
+                Array.wrap(glp).map do |glpp|
+                  [glpp.dig("polygonPoint", "pointLongitude"), glpp.dig("polygonPoint", "pointLatitude")].compact
+                end.compact
+              end.compact.presence,
+              }
           }
         end
 
diff --git a/spec/writers/schema_org_writer_spec.rb b/spec/writers/schema_org_writer_spec.rb
index 7e62d941..6db1f624 100644
--- a/spec/writers/schema_org_writer_spec.rb
+++ b/spec/writers/schema_org_writer_spec.rb
@@ -145,7 +145,7 @@
     it "author is organization" do
       input = fixture_path + 'gtex.xml'
       url = "https://ors.datacite.org/doi:/10.25491/9hx8-ke93"
-      content_url = "https://storage.googleapis.com/gtex_analysis_v7/single_tissue_eqtl_data/GTEx_Analysis_v7_eQTL_expression_matrices.tar.gz"  
+      content_url = "https://storage.googleapis.com/gtex_analysis_v7/single_tissue_eqtl_data/GTEx_Analysis_v7_eQTL_expression_matrices.tar.gz"
       subject = Bolognese::Metadata.new(input: input, url: url, content_url: content_url, from: "datacite")
       json = JSON.parse(subject.schema_org)
       expect(json["@id"]).to eq("https://doi.org/10.25491/9hx8-ke93")
@@ -281,8 +281,8 @@
       expect(json["name"]).to eq("Meteo measurements at the Sand Motor")
       expect(json["author"]).to eq("@type"=>"Person", "familyName"=>"Den Heijer", "givenName"=>"C", "name"=>"C Den Heijer")
       expect(json["includedInDataCatalog"]).to be_nil
-      expect(json["spatialCoverage"].dig("geo", "polygon").length).to eq(34)
-      expect(json["spatialCoverage"].dig("geo", "polygon").first).to eq(["4.1738852605822", "52.03913926329928"])
+      expect(json["spatialCoverage"].dig("geo", "polygon")[0].length).to eq(34)
+      expect(json["spatialCoverage"].dig("geo", "polygon")[0].first).to eq(["4.1738852605822", "52.03913926329928"])
     end
 
     it "from schema_org gtex" do