diff --git a/assets/js/_utils/pageviews.js b/assets/js/_utils/pageviews.js
index fbc0328..63db5af 100644
--- a/assets/js/_utils/pageviews.js
+++ b/assets/js/_utils/pageviews.js
@@ -75,14 +75,20 @@ const PvStorage = (function () {
       return PvStorage.getAllPageviews() > pv.totalsForAllResults["ga:pageviews"];
     },
     inspectKeys() {
-      if (localStorage.getItem(KEY_PV) === null
-        || localStorage.getItem(KEY_CREATION) === null) {
-        localStorage.clear();
+      for(let i = 0; i < localStorage.length; i++){
+        const key = localStorage.key(i);
+        switch (key) {
+          case KEY_PV:
+          case KEY_CREATION:
+            break;
+          default:
+            localStorage.clear();
+            return;
+        }
       }
     }
   };
-
-}()); /* PvData */
+}()); /* PvStorage */
 
 function countUp(min, max, destId) {
   if (min < max) {
diff --git a/assets/js/dist/pvreport.min.js b/assets/js/dist/pvreport.min.js
index c06ba19..904bc37 100644
--- a/assets/js/dist/pvreport.min.js
+++ b/assets/js/dist/pvreport.min.js
@@ -3,4 +3,4 @@
  * © 2019 Cotes Chung
  * MIT Licensed
  */
-const getInitStatus=function(){let t=!1;return()=>{var e=t;return t=t||!0,e}}(),PvOpts=function(){function e(e){e=$(e).attr("content");return void 0!==e&&!1!==e}return{getProxyEndpoint(){return $("meta[name=pv-proxy-endpoint]").attr("content")},getLocalData(){return $("meta[name=pv-cache-path]").attr("content")},hasProxyEndpoint(){return e("meta[name=pv-proxy-endpoint]")},hasLocalData(){return e("meta[name=pv-cache-path]")}}}(),PvStorage=function(){const t="pv",a="pv_created_date";function n(e,t){localStorage.setItem(e,t)}return{hasCache(){return null!==localStorage.getItem(t)},getCache(){return JSON.parse(localStorage.getItem(t))},saveCache(e){n(t,e),n(a,(new Date).toJSON())},isExpired(){let e=new Date((t=a,localStorage.getItem(t)));var t;return e.setHours(e.getHours()+1),Date.now()>=e.getTime()},getAllPageviews(){return PvStorage.getCache().totalsForAllResults["ga:pageviews"]},newerThan(e){return PvStorage.getAllPageviews()>e.totalsForAllResults["ga:pageviews"]},inspectKeys(){null!==localStorage.getItem(t)&&null!==localStorage.getItem(a)||localStorage.clear()}}}();function countUp(t,a,n){if(t<a){let e=new CountUp(n,t,a);e.error?console.error(e.error):e.start()}}function countPV(t,a){let n=0;if(void 0!==a)for(let e=0;e<a.length;++e)if(a[parseInt(e,10)][0]===t){n+=parseInt(a[parseInt(e,10)][1],10);break}return n}function tacklePV(e,t,a,n){let r=countPV(t,e);r=0===r?1:r,n?(n=parseInt(a.text().replace(/,/g,""),10),r>n&&countUp(n,r,a.attr("id"))):a.text((new Intl.NumberFormat).format(r))}function displayPageviews(e){if(void 0!==e){let t=getInitStatus();const a=e.rows;0<$("#post-list").length?$(".post-preview").each(function(){var e=$(this).find("a").attr("href");tacklePV(a,e,$(this).find(".pageviews"),t)}):0<$(".post").length&&(e=window.location.pathname,tacklePV(a,e,$("#pv"),t))}}function fetchProxyPageviews(){PvOpts.hasProxyEndpoint()&&$.ajax({type:"GET",url:PvOpts.getProxyEndpoint(),dataType:"jsonp",jsonpCallback:"displayPageviews",success:(e,t,a)=>{PvStorage.saveCache(JSON.stringify(e))},error:(e,t,a)=>{console.log("Failed to load pageviews from proxy server: "+a)}})}function loadPageviews(t=!1){PvOpts.hasLocalData()?fetch(PvOpts.getLocalData()).then(e=>e.json()).then(e=>{t&&PvStorage.newerThan(e)||(displayPageviews(e),PvStorage.saveCache(JSON.stringify(e)))}).then(()=>{fetchProxyPageviews()}):fetchProxyPageviews()}$(function(){$(".pageviews").length<=0||(PvStorage.inspectKeys(),PvStorage.hasCache()&&(displayPageviews(PvStorage.getCache()),!PvStorage.isExpired())||loadPageviews(PvStorage.hasCache()))});
\ No newline at end of file
+const getInitStatus=function(){let t=!1;return()=>{var e=t;return t=t||!0,e}}(),PvOpts=function(){function e(e){e=$(e).attr("content");return void 0!==e&&!1!==e}return{getProxyEndpoint(){return $("meta[name=pv-proxy-endpoint]").attr("content")},getLocalData(){return $("meta[name=pv-cache-path]").attr("content")},hasProxyEndpoint(){return e("meta[name=pv-proxy-endpoint]")},hasLocalData(){return e("meta[name=pv-cache-path]")}}}(),PvStorage=function(){const t="pv",a="pv_created_date";function r(e,t){localStorage.setItem(e,t)}return{hasCache(){return null!==localStorage.getItem(t)},getCache(){return JSON.parse(localStorage.getItem(t))},saveCache(e){r(t,e),r(a,(new Date).toJSON())},isExpired(){let e=new Date((t=a,localStorage.getItem(t)));var t;return e.setHours(e.getHours()+1),Date.now()>=e.getTime()},getAllPageviews(){return PvStorage.getCache().totalsForAllResults["ga:pageviews"]},newerThan(e){return PvStorage.getAllPageviews()>e.totalsForAllResults["ga:pageviews"]},inspectKeys(){for(let e=0;e<localStorage.length;e++)switch(localStorage.key(e)){case t:case a:break;default:return void localStorage.clear()}}}}();function countUp(t,a,r){if(t<a){let e=new CountUp(r,t,a);e.error?console.error(e.error):e.start()}}function countPV(t,a){let r=0;if(void 0!==a)for(let e=0;e<a.length;++e)if(a[parseInt(e,10)][0]===t){r+=parseInt(a[parseInt(e,10)][1],10);break}return r}function tacklePV(e,t,a,r){let n=countPV(t,e);n=0===n?1:n,r?(r=parseInt(a.text().replace(/,/g,""),10),n>r&&countUp(r,n,a.attr("id"))):a.text((new Intl.NumberFormat).format(n))}function displayPageviews(e){if(void 0!==e){let t=getInitStatus();const a=e.rows;0<$("#post-list").length?$(".post-preview").each(function(){var e=$(this).find("a").attr("href");tacklePV(a,e,$(this).find(".pageviews"),t)}):0<$(".post").length&&(e=window.location.pathname,tacklePV(a,e,$("#pv"),t))}}function fetchProxyPageviews(){PvOpts.hasProxyEndpoint()&&$.ajax({type:"GET",url:PvOpts.getProxyEndpoint(),dataType:"jsonp",jsonpCallback:"displayPageviews",success:(e,t,a)=>{PvStorage.saveCache(JSON.stringify(e))},error:(e,t,a)=>{console.log("Failed to load pageviews from proxy server: "+a)}})}function loadPageviews(t=!1){PvOpts.hasLocalData()?fetch(PvOpts.getLocalData()).then(e=>e.json()).then(e=>{t&&PvStorage.newerThan(e)||(displayPageviews(e),PvStorage.saveCache(JSON.stringify(e)))}).then(()=>{fetchProxyPageviews()}):fetchProxyPageviews()}$(function(){$(".pageviews").length<=0||(PvStorage.inspectKeys(),PvStorage.hasCache()&&(displayPageviews(PvStorage.getCache()),!PvStorage.isExpired())||loadPageviews(PvStorage.hasCache()))});
\ No newline at end of file