diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8bc4ada..3a78bbe 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -70,7 +70,6 @@ workflows:
             branches:
               only:
                 - develop
-                - feature/negative_length_error_fix
 
       # Production builds are exectuted only on tagged commits to the
       # master branch.
diff --git a/src/services/ProcessorService.js b/src/services/ProcessorService.js
index fd78490..f7ff713 100644
--- a/src/services/ProcessorService.js
+++ b/src/services/ProcessorService.js
@@ -728,6 +728,7 @@ processMessage.schema = {
     originator: Joi.string().required(),
     timestamp: Joi.date().required(),
     'mime-type': Joi.string().required(),
+    key: Joi.string().allow(null),
     payload: Joi.object().keys({
       legacyId: Joi.number().integer().positive(),
       legacy: Joi.object().keys({