diff --git a/src/models/partyplaner/login/Login.router.ts b/src/models/partyplaner/login/Login.router.ts
index 46537d0..fec4303 100644
--- a/src/models/partyplaner/login/Login.router.ts
+++ b/src/models/partyplaner/login/Login.router.ts
@@ -17,6 +17,15 @@ loginRouter.post('/:isDevCall', async (req: Request, res: Response) => {
         let password: string = '';
         let useDev: boolean = (req.params.isDevCall ?? '') === 'dev'; // TBD
 
+        // Send error when content-type header is missing
+        if (!req.headers['content-type']) {
+            res.status(400).send({
+                'status': 'MISSING_CONTENT_TYPE',
+                'message': 'Please set the content-type header field'
+            });
+            return;
+        }
+
         // API accepts both JSON in body and HTTP parameters
         if (req.headers['content-type'] === 'application/json') {
             username = req.body.username;
diff --git a/src/models/partyplaner/register/Register.router.ts b/src/models/partyplaner/register/Register.router.ts
index 786c1c1..6da865b 100644
--- a/src/models/partyplaner/register/Register.router.ts
+++ b/src/models/partyplaner/register/Register.router.ts
@@ -19,6 +19,15 @@ registerRouter.post('/:isDevCall', async (req: Request, res: Response) => {
         let password: string = '';
         let useDev: boolean = (req.params.isDevCall ?? '') === 'dev'; // TBD
 
+        // Send error when content-type header is missing
+        if (!req.headers['content-type']) {
+            res.status(400).send({
+                'status': 'MISSING_CONTENT_TYPE',
+                'message': 'Please set the content-type header field'
+            });
+            return;
+        }
+
         // API accepts both JSON in body and HTTP parameters
         if (req.headers['content-type'] === 'application/json') {
             username = req.body.username;