Add next(error) in returnErrorMiddleware

This makes it possible to add other custom error handlers.

Author: woutersmeenk

lib/server/error.js

@@ -37,6 +37,8 @@ const returnErrorMiddleware = (error, req, res, next) => {
 
   // Set and return response
   res.status(statusCode).json({ statusCode, message, stack });
+
+  next(error);
 };
 
 export default (app) => {