diff --git a/app/models/form_repository_rows_field_value.rb b/app/models/form_repository_rows_field_value.rb
index 3d1c23a7e..c5754c63a 100644
--- a/app/models/form_repository_rows_field_value.rb
+++ b/app/models/form_repository_rows_field_value.rb
@@ -21,13 +21,15 @@ class FormRepositoryRowsFieldValue < FormFieldValue
   before_save :attach_snapshot_files
 
   def attach_snapshot_files
-    # find asset values and attach file blobs
-    data.map { |r| r['repository_cells'] }.flatten.filter { |c| c['value_type'] == 'RepositoryAssetValue' }.each do |c|
-      blob_id = c.dig('repository_asset_value', 'asset', 'file', 'blob', 'id')
+    if data.present?
+      # find asset values and attach file blobs
+      data.map { |r| r['repository_cells'] }.flatten.filter { |c| c['value_type'] == 'RepositoryAssetValue' }.each do |c|
+        blob_id = c.dig('repository_asset_value', 'asset', 'file', 'blob', 'id')
 
-      next if snapshot_files.find { |f| f.blob.id == blob_id }
+        next if snapshot_files.find { |f| f.blob.id == blob_id }
 
-      snapshot_files.attach(ActiveStorage::Blob.find(blob_id))
+        snapshot_files.attach(ActiveStorage::Blob.find(blob_id))
+      end
     end
   end