diff --git a/dist/fallwall.min.js b/dist/fallwall.min.js
index e7d5612..9e01946 100644
--- a/dist/fallwall.min.js
+++ b/dist/fallwall.min.js
@@ -1,8 +1,8 @@
-"use strict";var _extends=Object.assign||function(r){for(var e=1;e<arguments.length;e++){var n=arguments[e];for(var t in n)Object.prototype.hasOwnProperty.call(n,t)&&(r[t]=n[t])}return r},_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(r){return typeof r}:function(r){return r&&"function"==typeof Symbol&&r.constructor===Symbol&&r!==Symbol.prototype?"symbol":typeof r};/*!
+"use strict";var _extends=Object.assign||function(r){for(var e=1;e<arguments.length;e++){var t=arguments[e];for(var n in t)Object.prototype.hasOwnProperty.call(t,n)&&(r[n]=t[n])}return r},_typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(r){return typeof r}:function(r){return r&&"function"==typeof Symbol&&r.constructor===Symbol&&r!==Symbol.prototype?"symbol":typeof r};/*!
  * Fallwall.js
  *
  * Copyright © 2017 Eddie Wen | MIT license
  * https://github.com/EddieWen-Taiwan/Fallwall.js
  */
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diff --git a/dist/fallwall.min.js.map b/dist/fallwall.min.js.map
index ec27ea8..14781bd 100644
--- a/dist/fallwall.min.js.map
+++ b/dist/fallwall.min.js.map
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i < defaults.gridNumber; i++ ) {\n\t\t\tif( dataArray[i] ) {\n\t\t\t\t_appendGrids( dataArray[i], 'down' );\n\t\t\t\tdefaults.currentGrid = i;\n\t\t\t}\n\t\t\telse {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\tif( callbackFunction ) {\n\t\t\tif( typeof callbackFunction === 'function' ) {\n\t\t\t\tcallbackFunction();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tconsole.error(`${callbackFunction} is not a function`);\n\t\t\t}\n\t\t}\n\n\t};\n\n\t/**\n\t * Add new grid\n\t * direction: up/down => grid is added at the top/bottom\n\t */\n\tconst _appendGrids = ( obj, direction ) => {\n\n\t\tlet thisCode = defaults.html_template;\n\n\t\tfor( let j = 0; j < Object.keys(obj).length; j++ ) {\n\t\t\tthisCode = thisCode.replace( `fallwall_#${j+1}`, obj[j] );\n\t\t}\n\n\t\tconst targetColumn = $('.fw_column').eq( _getShortestColumn() );\n\t\tlet creatingElement;\n\t\tif( direction === 'up' ) {\n\t\t\ttargetColumn.prepend( thisCode );\n\t\t\tcreatingElement = targetColumn.find('.fw_grid').first();\n\t\t}\n\t\telse {\n\t\t\ttargetColumn.append( thisCode );\n\t\t\tcreatingElement = targetColumn.find('.fw_grid').last();\n\t\t}\n\n\t\t/**\n\t\t * Add extra class\n\t\t * like animation class\n\t\t */\n\t\tif( defaults.defaultClass ) {\n\t\t\tcreatingElement.addClass( defaults.defaultClass );\n\t\t}\n\n\t};\n\n\t/**\n\t * Return the shortest fw_column to append a new grid\n\t */\n\tconst _getShortestColumn = () => {\n\n\t\tlet heightArray = [];\n\n\t\t$.each($('.fw_column'), (index, element) => {\n\t\t\theightArray.push( element.offsetHeight );\n\t\t});\n\n\t\treturn $.inArray( Math.min.apply( null, heightArray ), heightArray );\n\n\t};\n\n\t/**\n\t * Fallwall construtcor\n\t * Setup template and data source\n\t */\n\t$.fn.fallwall_init = function( template, dataArray, options, callbackFunction ) {\n\n\t\t/**\n\t\t * check required parameters\n\t\t */\n\t\tif( !template ) {\n\t\t\tthrow new Error('missed HTML template');\n\t\t}\n\n\t\tif( !dataArray ) {\n\t\t\tthrow new Error('missed data source');\n\t\t}\n\t\tif( !Array.isArray(dataArray) ) {\n\t\t\tthrow new Error('typeof dataArray is not correct');\n\t\t}\n\n\t\t// Store data from user\n\t\tdefaults = {\n\t\t\t...defaults,\n\t\t\thtml_template: `<div class='fw_grid'>${template}</div>`,\n\t\t\tdataArray: dataArray,\n\t\t\t...options,\n\t\t};\n\n\t\t// Add columns\n\t\tlet colElements = '';\n\t\tfor( let i = 0; i < defaults.columnNumber; i++ ) {\n\t\t\tcolElements += '<div class=\\'fw_column\\'></div>';\n\t\t}\n\t\tthis.append( colElements );\n\n\t\t// Prepare CSS\n\t\tthis.find('.fw_column').css({\n\t\t\t'vertical-align': 'top',\n\t\t\tdisplay: 'inline-block',\n\t\t\twidth: `${Math.floor(1000/defaults.columnNumber)/10}%`,\n\t\t});\n\n\t\t// Add grids at first\n\t\t_setFirstRoundContent( dataArray, callbackFunction );\n\n\t};\n\n\t/**\n\t * load more data and append them\n\t */\n\t$.fn.loadMoreFw = ( callbackFunction ) => {\n\n\t\t/**\n\t\t * fallwall initialization is not yet completed\n\t\t */\n\t\tif( defaults.dataArray.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif( defaults.currentGrid + 1 < defaults.dataArray.length ) {\n\n\t\t\tdefaults.currentGrid++;\n\t\t\tconst limitNum = defaults.currentGrid + defaults.gridNumber;\n\t\t\tfor( let i = defaults.currentGrid; i < limitNum; i++ ) {\n\n\t\t\t\tif( defaults.dataArray[i] ) {\n\n\t\t\t\t\t_appendGrids( defaults.dataArray[i], 'down' );\n\t\t\t\t\tdefaults.currentGrid = i;\n\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\t/**\n\t\t\t\t\t * Data is exhausted before last run in loop\n\t\t\t\t\t */\n\t\t\t\t\tif( callbackFunction ) {\n\t\t\t\t\t\tif( typeof callbackFunction === 'function' ) {\n\t\t\t\t\t\t\tcallbackFunction();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tconsole.error(`${callbackFunction} is not a function`);\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn 'NO_MORE_DATA';\n\t\t\t\t}\n\n\t\t\t\t/**\n\t\t\t\t * it is the last run of this loop\n\t\t\t\t */\n\t\t\t\tif( i === limitNum - 1 ) {\n\t\t\t\t\tif( callbackFunction ) {\n\t\t\t\t\t\tif( typeof callbackFunction === 'function' ) {\n\t\t\t\t\t\t\tcallbackFunction();\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\tconsole.error(`${callbackFunction} is not a function`);\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn 'FINISHED';\n\t\t\t\t}\n\n\t\t\t}\n\n\t\t}\n\n\t\t/**\n\t\t * There is no more data.\n\t\t */\n\t\treturn 'NO_MORE_DATA';\n\n\t};\n\n\t/**\n\t * directly append a new grid at the top of one column\n\t */\n\t$.fn.addFwGrid = ( data, callbackFunction ) => {\n\n\t\tif( typeof data !== 'object' ) {\n\t\t\tthrow new Error(`First parameter of addFwGrid(): ${data} must be Object`);\n\t\t}\n\n\t\t// Add a new grid\n\t\t_appendGrids( data, 'up' );\n\n\t\tif( callbackFunction ) {\n\t\t\tif( typeof callbackFunction === 'function' ) {\n\t\t\t\tcallbackFunction();\n\t\t\t}\n\t\t\telse {\n\t\t\t\tconsole.error(`${callbackFunction} is not a function`);\n\t\t\t}\n\t\t}\n\n\t};\n\n});\n"]}
\ No newline at end of file
diff --git a/package.json b/package.json
index ff20dde..1c9f59f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fallwall",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "Fallwall.js is a jQuery plugin to make Fall Styles like Pinterest.",
   "scripts": {
     "dist": "gulp",