From f298427ab840a9d242e924e2933b2a277509a5b2 Mon Sep 17 00:00:00 2001
From: Ryan Sobol <contact@ryansobol.com>
Date: Fri, 11 Nov 2016 15:51:13 -0800
Subject: [PATCH] Improve the solution

---
 index.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 1f21ae0..f6c279e 100644
--- a/index.js
+++ b/index.js
@@ -17,7 +17,9 @@ const drawCanvas = function() {
       return;
     }
 
-    event.target.classList.add(brushClass);
+    if (brushClass) {
+      event.target.classList.add(brushClass);
+    }
   });
 }