From f717226b3a44f918eec30b2d59ab257270189bc3 Mon Sep 17 00:00:00 2001
From: Rick Waldron <waldron.rick@gmail.com>
Date: Mon, 31 Dec 2012 18:06:38 -0500
Subject: [PATCH] Only splice from internal arrays when item actually exists.

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
---
 src/data.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/data.js b/src/data.js
index 6e1465b3b..e6915e9b8 100644
--- a/src/data.js
+++ b/src/data.js
@@ -122,8 +122,11 @@ Data.prototype = {
 	},
 	discard: function( owner ) {
 		var index = this.owners.indexOf( owner );
-		this.owners.splice( index, 1 );
-		this.cache.splice( index, 1 );
+
+		if ( index >= 0 ) {
+			this.owners.splice( index, 1 );
+			this.cache.splice( index, 1 );
+		}
 		return this;
 	}
 };