diff --git a/lib/paapi/item.rb b/lib/paapi/item.rb
index 8c657f1..be80f5e 100644
--- a/lib/paapi/item.rb
+++ b/lib/paapi/item.rb
@@ -128,22 +128,22 @@ module Paapi
 
     def height
       data = get(%w{ItemInfo ProductInfo ItemDimensions Height})
-      [data&.dig('DisplayValue'), data.dig('Unit')].join(' ')
+      [data&.dig('DisplayValue'), data&.dig('Unit')].join(' ')
     end
 
     def length
       data = get(%w{ItemInfo ProductInfo ItemDimensions Length})
-      [data&.dig('DisplayValue'), data.dig('Unit')].join(' ')
+      [data&.dig('DisplayValue'), data&.dig('Unit')].join(' ')
     end
 
     def width
       data = get(%w{ItemInfo ProductInfo ItemDimensions Width})
-      [data&.dig('DisplayValue'), data.dig('Unit')].join(' ')
+      [data&.dig('DisplayValue'), data&.dig('Unit')].join(' ')
     end
 
     def weight
       data = get(%w{ItemInfo ProductInfo ItemDimensions Weight})
-      [data&.dig('DisplayValue'), data.dig('Unit')].join(' ')
+      [data&.dig('DisplayValue'), data&.dig('Unit')].join(' ')
     end
 
     def kindle?