diff --git a/app/serializers/user_classification_counts_serializer.rb b/app/serializers/user_classification_counts_serializer.rb
index b786c67..ff92905 100644
--- a/app/serializers/user_classification_counts_serializer.rb
+++ b/app/serializers/user_classification_counts_serializer.rb
@@ -38,7 +38,13 @@ def response_data(user_counts, show_project_contributions:, show_time_spent:)
       end
       counts_grouped_by_period.map { |period, totals| { period: }.merge(totals) }
     else
-      user_counts
+      user_counts.map do |c|
+        period_data = {
+          period: c.period,
+          count: c.count
+        }
+        show_time_spent ? period_data.merge({ session_time: c.session_time }) : period_data
+      end
     end
   end
 
diff --git a/spec/controllers/user_classification_count_controller_spec.rb b/spec/controllers/user_classification_count_controller_spec.rb
index d8e754e..1d7b57b 100644
--- a/spec/controllers/user_classification_count_controller_spec.rb
+++ b/spec/controllers/user_classification_count_controller_spec.rb
@@ -28,7 +28,7 @@
         expect(response_body['data'][0]['count']).to eq(1)
       end
 
-      it 'returns total_count and time_spent and breakdown of user classifications wher period is given' do
+      it 'returns total_count and time_spent and breakdown of user classifications where period is given' do
         get :query, params: { id: classification_event.user_id, period: 'day', time_spent: true }
         expect(response.status).to eq(200)
         response_body = JSON.parse(response.body)
@@ -47,6 +47,13 @@
         expect(response_body['project_contributions'].length).to eq(1)
         expect(response_body['project_contributions'][0]['project_id']).to eq(classification_event.project_id)
       end
+
+      it 'returns user project classification counts without session_time if time_spent is false' do
+        get :query, params: { id: classification_event.user_id, project_id: 1, period: 'day' }
+        expect(response.status).to eq(200)
+        response_body = JSON.parse(response.body)
+        expect(response_body['data'][0]).not_to have_key('session_time')
+      end
     end
 
     context 'zooniverse_admin' do