diff --git a/app/models/recipe.rb b/app/models/recipe.rb
index ada1cf0..251e946 100644
--- a/app/models/recipe.rb
+++ b/app/models/recipe.rb
@@ -127,8 +127,14 @@ class Recipe < Ingredient
   end
 
   def update_rating!
-    self.rating = Log.for_recipe(self).for_user(self.user_id).where('rating IS NOT NULL').average(:rating)
-    save(validate: false)
+    logs = Log.for_recipe(self).for_user(self.user_id).where('rating IS NOT NULL')
+    if logs.count > 0
+      self.rating = logs.average(:rating)
+      save(validate: false)
+    else
+      self.rating = nil
+    end
+    self.rating
   end
 
   # Creates a copy of this recipe suitable for associating to a log
diff --git a/spec/lib/unit_conversion/parsed_number_spec.rb b/spec/lib/unit_conversion/parsed_number_spec.rb
index 7e44015..64baf6b 100644
--- a/spec/lib/unit_conversion/parsed_number_spec.rb
+++ b/spec/lib/unit_conversion/parsed_number_spec.rb
@@ -11,11 +11,11 @@ RSpec.describe UnitConversion::ParsedNumber do
   end
 
   it 'converts decimal numbers' do
-    expect(UnitConversion::ParsedNumber.new('1.0').value).to eq BigDecimal.new("1")
-    expect(UnitConversion::ParsedNumber.new('-1.0').value).to eq BigDecimal.new("-1")
-    expect(UnitConversion::ParsedNumber.new('54.33').value).to eq BigDecimal.new("54.33")
-    expect(UnitConversion::ParsedNumber.new('-54.33').value).to eq BigDecimal.new("-54.33")
-    expect(UnitConversion::ParsedNumber.new('.33').value).to eq BigDecimal.new("0.33")
+    expect(UnitConversion::ParsedNumber.new('1.0').value).to eq BigDecimal("1")
+    expect(UnitConversion::ParsedNumber.new('-1.0').value).to eq BigDecimal("-1")
+    expect(UnitConversion::ParsedNumber.new('54.33').value).to eq BigDecimal("54.33")
+    expect(UnitConversion::ParsedNumber.new('-54.33').value).to eq BigDecimal("-54.33")
+    expect(UnitConversion::ParsedNumber.new('.33').value).to eq BigDecimal("0.33")
   end
 
   it 'converts simple fractions' do