diff --git a/server/utils/zip.js b/server/utils/zip.js
index f4cbfe03..3b11d2ae 100644
--- a/server/utils/zip.js
+++ b/server/utils/zip.js
@@ -34,7 +34,11 @@ async function archiveToPath(zip) {
 
 export async function archiveCollection(collection: Collection) {
   const zip = new JSZip();
-  await addToArchive(zip, collection.documentStructure);
+
+  if (collection.documentStructure) {
+    await addToArchive(zip, collection.documentStructure);
+  }
+
   return archiveToPath(zip);
 }
 
@@ -42,8 +46,10 @@ export async function archiveCollections(collections: Collection[]) {
   const zip = new JSZip();
 
   for (const collection of collections) {
-    const folder = zip.folder(collection.name);
-    await addToArchive(folder, collection.documentStructure);
+    if (collection.documentStructure) {
+      const folder = zip.folder(collection.name);
+      await addToArchive(folder, collection.documentStructure);
+    }
   }
   return archiveToPath(zip);
 }