diff --git a/index.html b/index.html
index be4fd42..7a90cae 100644
--- a/index.html
+++ b/index.html
@@ -425,7 +425,7 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
         case 'CLOSING':
             if (save) try {
                 $.all('#actions > button').forEach(e => e.disabled = true);
-                let writable = await filehandle.createWritable({ mode: 'exclusive' });
+                var writable = await filehandle.createWritable({ mode: 'exclusive' });
                 let buffer = await filehandle.getFile().then(f => f.arrayBuffer());
                 let data = await Rpc2.invoke('merge', { params: [new Uint8Array(buffer).toBase64()] });
                 await writable.write(Uint8Array.fromBase64(data));
@@ -433,6 +433,7 @@ while (await new Promise(o => setTimeout(o, 1000, true))) {
                 await Rpc2.notify('close');
             } catch (e) {
                 if (Error.isError(e) && e.name === 'NoModificationAllowedError') continue;
+                await new Promise(fn => fn(writable.abort())).catch(() => null);
                 alert('(ERROR) ' + new String(e ?? 'File operation failed'));
             }
             save = false;