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	diff --git a/webroot/rsrc/js/application/differential/behavior-user-select.js b/webroot/rsrc/js/application/differential/behavior-user-select.js
	index 476d7b80b8..8db48b704d 100644
	--- a/webroot/rsrc/js/application/differential/behavior-user-select.js
	+++ b/webroot/rsrc/js/application/differential/behavior-user-select.js
	@@ -1,32 +1,33 @@
	/**
	* @provides javelin-behavior-differential-user-select
	* @requires javelin-behavior
	* javelin-dom
	* javelin-stratcom
	*/

	JX.behavior('differential-user-select', function() {

	var unselectable;

	function isOnRight(node) {
	- return node.parentNode.firstChild != node.previousSibling;
	+ return node.previousSibling &&
	+ node.parentNode.firstChild != node.previousSibling;
	}

	JX.Stratcom.listen(
	'mousedown',
	null,
	function(e) {
	var key = 'differential-unselectable';
	if (unselectable) {
	JX.DOM.alterClass(unselectable, key, false);
	}
	var diff = e.getNode('differential-diff');
	var td = e.getNode('tag:td');
	if (diff && td && isOnRight(td)) {
	unselectable = diff;
	JX.DOM.alterClass(diff, key, true);
	}
	});

	});