server_middleware.rb in opentracing-instrumentation-0.1.16

- old
+ new

@@ -60,9 +60,11 @@
           }
         end
 
         def extract_references(job)
           span_context = tracer.extract(OpenTracing::FORMAT_TEXT_MAP, job)
+          return unless span_context
+
           [OpenTracing::Reference.follows_from(span_context)]
         end
       end
     end
   end