diff --git a/wcs/wf/attachment.py b/wcs/wf/attachment.py
index 2151ce5c1..0d80f6610 100644
--- a/wcs/wf/attachment.py
+++ b/wcs/wf/attachment.py
@@ -114,7 +114,7 @@ class AddAttachmentWorkflowStatusItem(WorkflowStatusItem):
             title = self.title or _('Upload File')
         else:
             title = None
-        file_type = self.document_type.get('mimetypes')
+        file_type = (self.document_type or {}).get('mimetypes')
         form.add(FileWithPreviewWidget, 'attachment%s' % self.id, title=title,
                     required=self.required, hint=self.hint, file_type=file_type,
                     max_file_size=self.max_file_size)