diff --git a/HEADER.js b/HEADER.js
index ddc4196b..cca00f98 100644
--- a/HEADER.js
+++ b/HEADER.js
@@ -1,6 +1,6 @@
 /*! Fabric.js Copyright 2008-2011, Bitsonnet (Juriy Zaytsev, Maxim Chernyak) */
 
-var fabric = fabric || { version: "0.5.12" };
+var fabric = fabric || { version: "0.5.13" };
 
 if (typeof exports != 'undefined') {
   exports.fabric = fabric;
diff --git a/dist/all.js b/dist/all.js
index 72e559dd..3b59b7b3 100644
--- a/dist/all.js
+++ b/dist/all.js
@@ -1,6 +1,6 @@
 /*! Fabric.js Copyright 2008-2011, Bitsonnet (Juriy Zaytsev, Maxim Chernyak) */
 
-var fabric = fabric || { version: "0.5.12" };
+var fabric = fabric || { version: "0.5.13" };
 
 if (typeof exports != 'undefined') {
   exports.fabric = fabric;
@@ -2003,6 +2003,8 @@ fabric.Observable = {
    * @param {String} byProperty
    */
   function max(array, byProperty) {
+    if (!array || array.length === 0) return undefined;
+    
     var i = array.length - 1, 
         result = byProperty ? array[i][byProperty] : array[i];
     if (byProperty) {
@@ -2030,6 +2032,8 @@ fabric.Observable = {
    * @param {String} byProperty
    */
   function min(array, byProperty) {
+    if (!array || array.length === 0) return undefined;
+    
     var i = array.length - 1, 
         result = byProperty ? array[i][byProperty] : array[i];
 
@@ -9674,7 +9678,7 @@ fabric.util.object.extend(fabric.Canvas.prototype, {
     initialize: function(paths, options) {
       
       options = options || { };
-      this.paths = paths;
+      this.paths = paths || [ ];
       
       for (var i = this.paths.length; i--; ) {
         this.paths[i].group = this;
@@ -10281,14 +10285,14 @@ fabric.util.object.extend(fabric.Canvas.prototype, {
       minY = min(aY);
       maxY = max(aY);
       
-      width = maxX - minX;
-      height = maxY - minY;
+      width = (maxX - minX) || 0;
+      height = (maxY - minY) || 0;
       
       this.width = width;
       this.height = height;
       
-      this.left = minX + width / 2;
-      this.top = minY + height / 2;
+      this.left = (minX + width / 2) || 0;
+      this.top = (minY + height / 2) || 0;
     },
     
     /**
diff --git a/package.json b/package.json
index c1f3d2fb..5fe50eab 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {  
   "name": "fabric", 
   "description":  "Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.", 
-  "version":  "0.5.12", 
+  "version":  "0.5.13", 
   "author": "Juriy Zaytsev <kangax@gmail.com>", 
   "keywords": ["canvas", "graphic", "graphics", "SVG", "node-canvas", "parser", "HTML5", "object model"],
   "repository": "git://github.com/kangax/fabric.js", 
diff --git a/src/group.class.js b/src/group.class.js
index a269e80d..d8a9f419 100644
--- a/src/group.class.js
+++ b/src/group.class.js
@@ -405,14 +405,14 @@
       minY = min(aY);
       maxY = max(aY);
       
-      width = maxX - minX;
-      height = maxY - minY;
+      width = (maxX - minX) || 0;
+      height = (maxY - minY) || 0;
       
       this.width = width;
       this.height = height;
       
-      this.left = minX + width / 2;
-      this.top = minY + height / 2;
+      this.left = (minX + width / 2) || 0;
+      this.top = (minY + height / 2) || 0;
     },
     
     /**
diff --git a/src/path_group.class.js b/src/path_group.class.js
index aeee30c2..968e7962 100644
--- a/src/path_group.class.js
+++ b/src/path_group.class.js
@@ -45,7 +45,7 @@
     initialize: function(paths, options) {
       
       options = options || { };
-      this.paths = paths;
+      this.paths = paths || [ ];
       
       for (var i = this.paths.length; i--; ) {
         this.paths[i].group = this;
diff --git a/src/util/lang_array.js b/src/util/lang_array.js
index 652b2d6d..4ebdb3db 100644
--- a/src/util/lang_array.js
+++ b/src/util/lang_array.js
@@ -147,6 +147,8 @@
    * @param {String} byProperty
    */
   function max(array, byProperty) {
+    if (!array || array.length === 0) return undefined;
+    
     var i = array.length - 1, 
         result = byProperty ? array[i][byProperty] : array[i];
     if (byProperty) {
@@ -174,6 +176,8 @@
    * @param {String} byProperty
    */
   function min(array, byProperty) {
+    if (!array || array.length === 0) return undefined;
+    
     var i = array.length - 1, 
         result = byProperty ? array[i][byProperty] : array[i];