diff --git a/helpers/utils/contenttypes.js b/helpers/utils/contenttypes.js
index d9f1d817..efd94f72 100644
--- a/helpers/utils/contenttypes.js
+++ b/helpers/utils/contenttypes.js
@@ -9,7 +9,7 @@ export const knownContentTypes = [
 ]
 
 export function isJSONContentType(contentType) {
-  if (contentType.includes(";")) {
+  if (contentType && contentType.includes(";")) {
     const [justContentType] = contentType.split(";")
 
     return (