diff --git a/packages/apps-engine/src/definition/api/ApiEndpoint.ts b/packages/apps-engine/src/definition/api/ApiEndpoint.ts
index 08d06f8f9f05a..afdcb1062fce7 100644
--- a/packages/apps-engine/src/definition/api/ApiEndpoint.ts
+++ b/packages/apps-engine/src/definition/api/ApiEndpoint.ts
@@ -30,7 +30,7 @@ export abstract class ApiEndpoint implements IApiEndpoint {
 	 * @param reponse
 	 */
 	protected json(response: IApiResponseJSON): IApiResponse {
-		if (!response?.headers['content-type']) {
+		if (!response?.headers?.['content-type']) {
 			response.headers = response.headers || {};
 			response.headers['content-type'] = 'application/json';
 		}