diff --git a/packages/server/src/utilities/rowProcessor/attachments.ts b/packages/server/src/utilities/rowProcessor/attachments.ts
index c289680eb3..e1c83352d4 100644
--- a/packages/server/src/utilities/rowProcessor/attachments.ts
+++ b/packages/server/src/utilities/rowProcessor/attachments.ts
@@ -43,7 +43,7 @@ export class AttachmentCleanup {
         if ((columnRemoved && !renaming) || opts.deleting) {
           rows.forEach(row => {
             files = files.concat(
-              row[key].map((attachment: any) => attachment.key)
+              (row[key] || []).map((attachment: any) => attachment.key)
             )
           })
         }