diff --git a/package-lock.json b/package-lock.json
index 8c2cbd6..c012042 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@github/file-attachment-element",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index cb40389..858bb75 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@github/file-attachment-element",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "Attach files via drag and drop or file input.",
   "main": "dist/index.umd.js",
   "module": "dist/index.js",
diff --git a/src/attachment.ts b/src/attachment.ts
index d1aa159..19a466b 100644
--- a/src/attachment.ts
+++ b/src/attachment.ts
@@ -97,7 +97,7 @@ function transferredFiles(transfer: DataTransfer, directory: boolean): Promise<A
   if (directory && isDirectory(transfer)) {
     return traverse('', roots(transfer))
   }
-  return Promise.resolve(visible(Array.from(transfer.files)).map(f => new Attachment(f)))
+  return Promise.resolve(visible(Array.from(transfer.files || [])).map(f => new Attachment(f)))
 }
 
 function hidden(file: File | FileSystemEntry): boolean {