diff --git a/tools/migration/use-gridfs.js b/tools/migration/use-gridfs.js
index 148f9be26..f13d3c874 100644
--- a/tools/migration/use-gridfs.js
+++ b/tools/migration/use-gridfs.js
@@ -19,7 +19,7 @@ const writeToGridFS = (bucket, buffer, ...rest) => new Promise((resolve, reject)
 
 const migrateToGridFS = async (doc) => {
 	const id = doc._id
-	const buffer = doc.data.buffer
+	const buffer = doc.data ? doc.data.buffer : Buffer.from([0x00]) // アップロードのバグなのか知らないけどなぜか data が存在しない drive_file ドキュメントがまれにあることがわかったので
 	const created_at = doc.created_at
 	const name = doc.name