diff --git a/js/piwik.js b/js/piwik.js
index b5608f1230030297490f44a210f653111632d6b5..c082e34272851f3555957056dd820f5a0a96cb80 100644
--- a/js/piwik.js
+++ b/js/piwik.js
@@ -28,7 +28,7 @@
 
 /*global JSON2:true */
 
-if (typeof JSON2 !== 'object' && window.JSON) {
+if (typeof JSON2 !== 'object' && typeof window.JSON === 'object' && window.JSON.stringify && window.JSON.parse) {
     JSON2 = window.JSON;
 } else {
     (function () {
diff --git a/piwik.js b/piwik.js
index dc2a967e7ebd781390c953527a4deeeca7220e17..a96e6070f38a11cf1116c37fff38e70c1bbb984f 100644
--- a/piwik.js
+++ b/piwik.js
@@ -8,7 +8,7 @@
  * @license http://piwik.org/free-software/bsd/ BSD-3 Clause (also in js/LICENSE.txt)
  * @license magnet:?xt=urn:btih:c80d50af7d3db9be66a4d0a86db0286e4fd33292&dn=bsd-3-clause.txt BSD-3-Clause
  */
-if(typeof JSON2!=="object"&&window.JSON){JSON2=window.JSON}else{(function(){var a={};
+if(typeof JSON2!=="object"&&typeof window.JSON==="object"&&window.JSON.stringify&&window.JSON.parse){JSON2=window.JSON}else{(function(){var a={};
 /*! JSON v3.3.2 | http://bestiejs.github.io/json3 | Copyright 2012-2014, Kit Cambridge | http://kit.mit-license.org */
 (function(){var c=typeof define==="function"&&define.amd;var e={"function":true,object:true};var h=e[typeof a]&&a&&!a.nodeType&&a;var i=e[typeof window]&&window||this,b=h&&e[typeof module]&&module&&!module.nodeType&&typeof global=="object"&&global;if(b&&(b.global===b||b.window===b||b.self===b)){i=b}function j(ab,V){ab||(ab=i.Object());V||(V=i.Object());var K=ab.Number||i.Number,R=ab.String||i.String,x=ab.Object||i.Object,S=ab.Date||i.Date,T=ab.SyntaxError||i.SyntaxError,aa=ab.TypeError||i.TypeError,J=ab.Math||i.Math,Y=ab.JSON||i.JSON;
 if(typeof Y=="object"&&Y){V.stringify=Y.stringify;V.parse=Y.parse}var n=x.prototype,u=n.toString,r,m,L;var B=new S(-3509827334573292);try{B=B.getUTCFullYear()==-109252&&B.getUTCMonth()===0&&B.getUTCDate()===1&&B.getUTCHours()==10&&B.getUTCMinutes()==37&&B.getUTCSeconds()==6&&B.getUTCMilliseconds()==708}catch(v){}function o(ac){if(o[ac]!==L){return o[ac]}var ad;if(ac=="bug-string-char-index"){ad="a"[0]!="a"}else{if(ac=="json"){ad=o("json-stringify")&&o("json-parse")}else{var ak,ah='{"a":[1,true,false,null,"\\u0000\\b\\n\\f\\r\\t"]}';if(ac=="json-stringify"){var ai=V.stringify,aj=typeof ai=="function"&&B;if(aj){(ak=function(){return 1}).toJSON=ak;try{aj=ai(0)==="0"&&ai(new K())==="0"&&ai(new R())=='""'&&ai(u)===L&&ai(L)===L&&ai()===L&&ai(ak)==="1"&&ai([ak])=="[1]"&&ai([L])=="[null]"&&ai(null)=="null"&&ai([L,u,null])=="[null,null,null]"&&ai({a:[ak,true,false,null,"\x00\b\n\f\r\t"]})==ah&&ai(null,ak)==="1"&&ai([1,2],null,1)=="[\n 1,\n 2\n]"&&ai(new S(-8640000000000000))=='"-271821-04-20T00:00:00.000Z"'&&ai(new S(8640000000000000))=='"+275760-09-13T00:00:00.000Z"'&&ai(new S(-62198755200000))=='"-000001-01-01T00:00:00.000Z"'&&ai(new S(-1))=='"1969-12-31T23:59:59.999Z"'