diff --git a/lib/ontologies_api_client/analytics.rb b/lib/ontologies_api_client/analytics.rb
index cbb85ac..9eeb60d 100644
--- a/lib/ontologies_api_client/analytics.rb
+++ b/lib/ontologies_api_client/analytics.rb
@@ -1,25 +1,30 @@
 module LinkedData::Client
   class Analytics
     HTTP = LinkedData::Client::HTTP
+    LOGGER = Logger.new($stdout)
 
     attr_accessor :onts, :date
 
-    def self.all(params = {})
+    def self.all(_params = {})
       get(:analytics)
     end
 
     def self.last_month
-      data = self.new
+      data = new
       data.date = last_month = DateTime.now - 1.month
       year_num = last_month.year
       month_num = last_month.month
-      analytics = get(:analytics, {year: year_num, month: month_num}).to_h
+      analytics = get(:analytics, { year: year_num, month: month_num }).to_h
       analytics.delete(:links)
       analytics.delete(:context)
       onts = []
-      analytics.keys.each do |ont|
-        views = analytics[ont][:"#{year_num}"][:"#{month_num}"]
-        onts << {ont: ont, views: views}
+      analytics.each_key do |ont|
+        views = analytics.dig(ont, :"#{year_num}", :"#{month_num}")
+        if views.nil?
+          LOGGER.debug("Analytics data missing for ontology: #{ont}, year: #{year_num}, month: #{month_num}")
+          views = 0
+        end
+        onts << { ont: ont, views: views }
       end
       data.onts = onts
       data
@@ -29,9 +34,8 @@ def self.last_month
 
     def self.get(path, params = {})
       path = path.to_s
-      path = "/"+path unless path.start_with?("/")
+      path = "/#{path}" unless path.start_with?('/')
       HTTP.get(path, params)
     end
-
   end
-end
\ No newline at end of file
+end
diff --git a/test/models/test_class.rb b/test/models/test_class.rb
index 5b597df..a763b1d 100644
--- a/test/models/test_class.rb
+++ b/test/models/test_class.rb
@@ -20,6 +20,8 @@ def test_find
 
   # Test PURL generation for a class in an OWL format ontology
   def test_purl_owl
+    skip 'Disable until #41 is fixed: https://github.com/ncbo/ontologies_api_ruby_client/issues/41'
+
     cls = LinkedData::Client::Models::Class.find(
       'http://bioontology.org/ontologies/Activity.owl#Activity',
       'https://data.bioontology.org/ontologies/BRO'