diff --git a/app/models/product.rb b/app/models/product.rb
index 6b537b5..9d74d19 100644
--- a/app/models/product.rb
+++ b/app/models/product.rb
@@ -196,6 +196,7 @@ class Product < ActiveRecord::Base
   end
 
   def price_description_percentage
+    return 0 if price.blank? || price.zero?
     total_production_cost * 100 / price
   end
 
diff --git a/test/unit/product_test.rb b/test/unit/product_test.rb
index e7f6c5b..e633489 100644
--- a/test/unit/product_test.rb
+++ b/test/unit/product_test.rb
@@ -510,4 +510,26 @@ class ProductTest < Test::Unit::TestCase
     assert_equal "50.00", product.formatted_value(:inputs_cost)
   end
 
+  should 'return 0 on price_description_percentage by default' do
+    assert_equal 0, Product.new.price_description_percentage
+  end
+
+  should 'return 0 on price_description_percentage if price is 0' do
+    product = fast_create(Product, :price => 0)
+
+    assert_equal 0, product.price_description_percentage
+  end
+
+  should 'return 0 on price_description_percentage if price is not defined' do
+    product = fast_create(Product)
+
+    assert_equal 0, product.price_description_percentage
+  end
+
+  should 'return 0 on price_description_percentage if total_production_cost is 0' do
+    product = fast_create(Product, :price => 50)
+
+    assert_equal 0, product.price_description_percentage
+  end
+
 end
--
libgit2 0.21.2