diff --git a/ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts b/ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts
index 1503abd73446130ef06f332c9685d7bfd88e38f0..421888eb6e1290a4b1051abc1364c6b93811ccc8 100644
--- a/ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts
+++ b/ExpressAPI/src/middlewares/ClientVersionCheckerMiddleware.ts
@@ -26,6 +26,8 @@ class ClientVersionCheckerMiddleware {
                 }
 
                 new Session().sendResponse(res, HttpStatusCode.MethodNotAllowed, {}, `Unsupported client.`, DojoStatusCode.CLIENT_NOT_SUPPORTED);
+            } else {
+                new Session().sendResponse(res, HttpStatusCode.MethodNotAllowed, {}, `Missing client headers.`, DojoStatusCode.CLIENT_HEADER_MISSING);
             }
         };
     }
diff --git a/ExpressAPI/src/shared b/ExpressAPI/src/shared
index 75fedb26c47bb6f707725307a79a45a13e62496d..7c5131a6ce0f314b69cf14a2ab5b59c9c68bb781 160000
--- a/ExpressAPI/src/shared
+++ b/ExpressAPI/src/shared
@@ -1 +1 @@
-Subproject commit 75fedb26c47bb6f707725307a79a45a13e62496d
+Subproject commit 7c5131a6ce0f314b69cf14a2ab5b59c9c68bb781