diff --git a/web/src/upload_widget.ts b/web/src/upload_widget.ts
index 94406741dc..c795c45731 100644
--- a/web/src/upload_widget.ts
+++ b/web/src/upload_widget.ts
@@ -79,9 +79,9 @@ export function build_widget(
 
     get_file_input().attr("accept", supported_types.toString());
     get_file_input().on("change", (e) => {
-        if (e.target.files?.length === 0) {
+        if (e.target.files?.[0] === undefined) {
             $input_error.hide();
-        } else if (e.target.files?.length === 1) {
+        } else if (e.target.files.length === 1) {
             const file = e.target.files[0];
             if (file.size > max_file_upload_size * 1024 * 1024) {
                 $input_error.text(
@@ -167,9 +167,9 @@ export function build_direct_upload_widget(
 
     get_file_input().attr("accept", supported_types.toString());
     get_file_input().on("change", (e) => {
-        if (e.target.files?.length === 0) {
+        if (e.target.files?.[0] === undefined) {
             $input_error.hide();
-        } else if (e.target.files?.length === 1) {
+        } else if (e.target.files.length === 1) {
             const file = e.target.files[0];
             if (file.size > max_file_upload_size * 1024 * 1024) {
                 $input_error.text(