From f261d5ad3396455d4c0beb1ce4f98520c51cb9a5 Mon Sep 17 00:00:00 2001
From: abe33 <cedric.nehemie@gmail.com>
Date: Fri, 30 Oct 2015 19:38:56 +0100
Subject: [PATCH] :bug: Fix unusual issue if an invisible char is not a string

Fixes #397
---
 lib/mixins/canvas-drawer.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mixins/canvas-drawer.coffee b/lib/mixins/canvas-drawer.coffee
index 1a4733d6..1e817aed 100644
--- a/lib/mixins/canvas-drawer.coffee
+++ b/lib/mixins/canvas-drawer.coffee
@@ -216,7 +216,7 @@ class CanvasDrawer extends Mixin
       invisibles.push line.invisibles.space if line.invisibles.space?
       invisibles.push line.invisibles.tab if line.invisibles.tab?
 
-      ///#{invisibles.map(_.escapeRegExp).join('|')}///g
+      ///#{invisibles.filter((s) -> typeof s is 'string').map(_.escapeRegExp).join('|')}///g
 
   # Internal: Draws a single token on the given context.
   #