button click event tag json error (1 reply)

<a href="#" onclick="javascript:_paq.push(['trackEvent', 'Menu', 'Freedom']);">Freedom page</a>

I used that javascript

but it is error



at Object.stringify (native)
at appendCustomVariablesToRequest (http://mng.logbox.co.kr/piwik.js:3108:60)
at getRequest (http://mng.logbox.co.kr/piwik.js:3118:28)
at logEvent (http://mng.logbox.co.kr/piwik.js:3773:31)
at http://mng.logbox.co.kr/piwik.js:5312:25
at trackCallback (http://mng.logbox.co.kr/piwik.js:3870:17)
at Object.Piwik.trackEvent (http://mng.logbox.co.kr/piwik.js:5311:21)
at Object.apply [as push] (http://mng.logbox.co.kr/piwik.js:580:37)
at <anonymous>:2:6
at Object.InjectedScript._evaluateOn (<anonymous>:895:140)appendCustomVariablesToRequest @ piwik.js:3108getRequest @ piwik.js:3118logEvent @ piwik.js:3773(anonymous function) @ piwik.js:5312trackCallback @ piwik.js:3870Piwik.trackEvent @ piwik.js:5311apply @ piwik.js:580(anonymous function) @ VM1375:2InjectedScript._evaluateOn @ VM1370:895InjectedScript._evaluateAndWrap @ VM1370:828InjectedScript.evaluate @ VM1370:694



3108 lines
3106 // Custom Variables, scope "page"
3107 function appendCustomVariablesToRequest(customVariables, parameterName) {
3108 var customVariablesStringified = JSON2.stringify(customVariables);
3109 if (customVariablesStringified.length > 2) {
3110 return '&' + parameterName + '=' + encodeWrapper(customVariablesStringified);
3111 }
3112 return '';
3113 }