diff --git a/src/layer.js b/src/layer.js
index 0cc4e0d..8a9b970 100644
--- a/src/layer.js
+++ b/src/layer.js
@@ -773,7 +773,7 @@ layer.style = function(index, options, limit){
   }
   
   layero.css(options);
-  btnHeight = layero.find('.'+doms[6]).outerHeight();
+  btnHeight = layero.find('.'+doms[6]).outerHeight()||0; //bug fix from Yuri2 (undefined btnHeight in jq3)
   
   if(type === ready.type[2]){
     layero.find('iframe').css({