diff --git a/lib/rspec_api_documentation/writers/open_api_writer.rb b/lib/rspec_api_documentation/writers/open_api_writer.rb
index ed5d0420..1c55149d 100644
--- a/lib/rspec_api_documentation/writers/open_api_writer.rb
+++ b/lib/rspec_api_documentation/writers/open_api_writer.rb
@@ -144,7 +144,7 @@ def extract_schema(fields)
           opts = {enum: field[:enum], minimum: field[:minimum], maximum: field[:maximum]}
 
           if current[:properties][field[:name]][:type] == :array
-            current[:properties][field[:name]][:items] = field[:items] || OpenApi::Helper.extract_items(field[:value][0], opts)
+            current[:properties][field[:name]][:items] = field[:items] || OpenApi::Helper.extract_items(field[:value], opts)
           else
             opts.each { |k, v| current[:properties][field[:name]][k] = v if v }
           end