diff --git a/lib/jekyll-seo-tag/json_ld_drop.rb b/lib/jekyll-seo-tag/json_ld_drop.rb
index 95c2c74..d51404f 100644
--- a/lib/jekyll-seo-tag/json_ld_drop.rb
+++ b/lib/jekyll-seo-tag/json_ld_drop.rb
@@ -92,7 +92,7 @@ module Jekyll
       def to_json(state = nil)
         keys.sort.each_with_object({}) do |(key, _), result|
           v = self[key]
-          result[key] = v if v # don't write if value is nil
+          result[key] = v unless v.nil?
         end.to_json(state)
       end