fix issue #4930, by only calling offset() after checking vals.length

diff --git a/js/foundation/foundation.equalizer.js b/js/foundation/foundation.equalizer.js
index 3ad4f2dafc07897dbf3c2e74c23c850531ab9d6f..403b2fd43ad86fcf2fbaca264749b9705c9c0523 100644 (file)
--- a/js/foundation/foundation.equalizer.js
+++ b/js/foundation/foundation.equalizer.js
@@ -28,10 +28,10 @@
     equalize: function(equalizer) {
       var isStacked = false,
           vals = equalizer.find('[' + this.attr_name() + '-watch]:visible'),
-          firstTopOffset = vals.first().offset().top,
           settings = equalizer.data(this.attr_name(true)+'-init');
 
       if (vals.length === 0) return;
+      var firstTopOffset = vals.first().offset().top;
       settings.before_height_change();
       equalizer.trigger('before-height-change');
       vals.height('inherit');