Only splice from internal arrays when item actually exists.

rwaldron · rwaldron · commit f717226b3a44 · 2012-12-31T18:06:38.000-05:00
Signed-off-by: Rick Waldron &lt;waldron.rick@gmail.com&gt;
diff --git 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;
 	}
 };
