diff --git a/services/docstore/app/coffee/HttpController.coffee b/services/docstore/app/coffee/HttpController.coffee
index 0dec71141e..2b8d49d93c 100644
--- a/services/docstore/app/coffee/HttpController.coffee
+++ b/services/docstore/app/coffee/HttpController.coffee
@@ -72,4 +72,4 @@ module.exports = HttpController =
 		}
 
 	_buildRawDocView: (doc)->
-		return doc.lines.join("\n")
+		return (doc?.lines or []).join("\n")