diff --git a/app/Http/Controllers/DocumentAPIController.php b/app/Http/Controllers/DocumentAPIController.php
index 01a05a17e2fa..3dd225d1445d 100644
--- a/app/Http/Controllers/DocumentAPIController.php
+++ b/app/Http/Controllers/DocumentAPIController.php
@@ -52,7 +52,10 @@ class DocumentAPIController extends BaseAPIController
     {
         $document = $request->entity();
 
-        return DocumentController::getDownloadResponse($document);
+        if(array_key_exists($document->type, Document::$types))
+            return DocumentController::getDownloadResponse($document);
+        else
+            return $this->errorResponse(['error'=>'Invalid mime type'],400);
     }
 
     /**