Index: wp-includes/js/wplink.js
===================================================================
--- wp-includes/js/wplink.js	(revision 39161)
+++ wp-includes/js/wplink.js	(working copy)
@@ -730,6 +730,9 @@
 			if ( ! this.query.ready() || bottom < this.contentHeight.height() - wpLink.riverBottomThreshold )
 				return;
 
+			f ( ! this.visible )
+				return;
+
 			setTimeout(function() {
 				var newTop = el.scrollTop(),
 					newBottom = newTop + el.height();