From 5c6e78eab51d325d3b13db9810e014447bd5135b Mon Sep 17 00:00:00 2001
From: Devine Lu Linvega <aliceffekt@gmail.com>
Date: Mon, 15 Jul 2019 14:28:49 +0900
Subject: [PATCH] Catch empty input

---
 desktop/sources/scripts/lisp.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/desktop/sources/scripts/lisp.js b/desktop/sources/scripts/lisp.js
index 4132d41..789d0d0 100644
--- a/desktop/sources/scripts/lisp.js
+++ b/desktop/sources/scripts/lisp.js
@@ -66,6 +66,8 @@ function Lisp (input, lib) {
   }
 
   const interpret = function (input, context) {
+    if (!input) { return null }
+
     if (context === undefined) {
       return interpret(input, new Context(lib))
     } else if (input instanceof Array) {