diff --git a/assets/js/page_image_detail.js b/assets/js/page_image_detail.js
index d0c643497b1634a8cab805500ec4568899e697a9..9bda634a18ece173ed5194b60b7951c87b55c1e8 100644
--- a/assets/js/page_image_detail.js
+++ b/assets/js/page_image_detail.js
@@ -25,6 +25,7 @@ let hasChangedEver = false;
 const currentState = () => {
     const data = new FormData(document.forms.namedItem("upload"));
     data.append("from_js", "true");
+    return data;
 };
 
 const doSave = () => {