Since the Grape v0.14.1, the after callback is always called, so response could be nil if the called fail with an exception

lib/grape_logging/loggers/response.rb

@@ -2,9 +2,13 @@ module GrapeLogging
   module Loggers
     class Response < GrapeLogging::Loggers::Base
       def parameters(request, response)
-        {
-          response: serialized_response_body(response)
-        }
+        if response
+          {
+            response: serialized_response_body(response)
+          }
+        else
+          {}
+        end
       end
 
       private

lib/grape_logging/middleware/request_logger.rb

@@ -51,7 +51,7 @@ module GrapeLogging
       protected
       def parameters
         {
-          status: response.status,
+          status: response.try(:status),
           time: {
             total: total_runtime,
             db: db_runtime,