diff --git a/rapids/templates/rapids/rapid_form.html b/rapids/templates/rapids/rapid_form.html
index 90e88360..bea584f8 100755
--- a/rapids/templates/rapids/rapid_form.html
+++ b/rapids/templates/rapids/rapid_form.html
@@ -466,7 +466,7 @@
             n = el.id.split("-")[1];
             $(`#drop-filenames span[data-input-id='${el.id}']`).remove();
 
-            let extra_class;
+            let extra_class = "";
             let imageId;
             if (el.files[0].type.startsWith("image")) {
                 base = await blobToBase64(el.files[0]);