diff --git a/appAuthHelper.js b/appAuthHelper.js
index ebf6fc8..0951bae 100644
--- a/appAuthHelper.js
+++ b/appAuthHelper.js
@@ -257,6 +257,12 @@
         },
         registerIdentityProxy: function () {
             return new Promise((function (resolve) {
+                // handle the case when the identity proxy was already registered
+                if (this.identityProxy) {
+                    resolve();
+                    return;
+                }
+
                 if (this.identityProxyPreference === "serviceWorker" && "serviceWorker" in navigator) {
                     var savedReg,tick;
                     var registerServiceWorker = (function() {
diff --git a/appAuthHelperBundle.js b/appAuthHelperBundle.js
index f1c14e3..0c3eeeb 100644
--- a/appAuthHelperBundle.js
+++ b/appAuthHelperBundle.js
@@ -43,4 +43,4 @@ License for AppAuthHelper (Apache 2.0) :
 Copyright (c) 2019 ForgeRock, Inc.
 
 */
-"use strict";function _typeof(a){"@babel/helpers - typeof";return _typeof="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(a){return typeof a}:function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a},_typeof(a)}(function(a){if("object"===("undefined"==typeof exports?"undefined":_typeof(exports))&&"undefined"!=typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var b;b="undefined"==typeof window?"undefined"==typeof global?"undefined"==typeof self?this:self:global:window,b.AppAuthHelper=a()}})(function(){return function(){function b(d,e,g){function a(j,i){if(!e[j]){if(!d[j]){var f="function"==typeof require&&require;if(!i&&f)return f(j,!0);if(h)return h(j,!0);var c=new Error("Cannot find module '"+j+"'");throw c.code="MODULE_NOT_FOUND",c}var k=e[j]={exports:{}};d[j][0].call(k.exports,function(b){var c=d[j][1][b];return a(c||b)},k,k.exports,b,d,e,g)}return 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sendRequestMessage(a){var b=this;return new Promise(function(c,d){var e=new MessageChannel;b.transmissionPort.postMessage({message:"makeRSRequest",request:a},[e.port2]),e.port1.onmessage=function(a){a.data.response?b.deserializeResponse(a.data.response).then(c):d(a.data.error)}})},fixupBlobContentType:function fixupBlobContentType(a){var b=a.type.match(/multipart\/form-data; boundary=(----webkitformboundary.*)/);return b?new Promise(function(c){a.arrayBuffer().then(function(d){var e=new TextDecoder().decode(d),f=e.match(/--(-+WebKitFormBoundary.*)/);2<=f.length?c(new Blob([e.replace(new RegExp(f[1],"g"),b[1])],{type:a.type})):c(a)})}):Promise.resolve(a)},interceptRequest:function interceptRequest(a,b){var c=this;return new Promise(function(d,e){return c.serializeRequest(a).then(function(a){return c.sendRequestMessage(a).then(d,function(f){"invalid_token"===f?(c.waitForRenewedToken(b).then(function(){return c.sendRequestMessage(a)}).then(d,e),c.renewTokens(b)):e(f)})})})},serializeRequest:function serializeRequest(){},deserializeResponse:function deserializeResponse(){}}})()},{}],2:[function(a,b){(function(){"use strict";var c=a("./IdentityProxyCore"),d=function(){var a=this,b=XMLHttpRequest.prototype.open,d=XMLHttpRequest.prototype.setRequestHeader,e=XMLHttpRequest.prototype.getAllResponseHeaders,f=XMLHttpRequest.prototype.getResponseHeader,g=XMLHttpRequest.prototype.send;return XMLHttpRequest.prototype.open=function(a,c,d){if("undefined"!=typeof d&&!d)throw"Synchronous XHR requests not supported";var e=document.createElement("a");return e.href=c,this.url=e.href,this.method=a,b.apply(this,arguments)},XMLHttpRequest.prototype.setRequestHeader=function(a,b){return this.headers=this.headers||{},a=a.toLowerCase(),this.headers[a]=this.headers[a]?"".concat(this.headers[a],",").concat(b):b,d.call(this,a,b)},XMLHttpRequest.prototype.send=function(b){var c=this;if(this.headers=this.headers||{},"true"===this.headers["x-appauthhelper-anonymous"])return this.customResponse=!1,void g.call(this,b);var d=a.getResourceServerFromUrl(this.url);d&&!this.headers.authorization?(this.customResponse=!0,a.interceptRequest({xhr:this,body:b},d).then(function(){Object.defineProperty(c,"readyState",{get:function get(){return 4}}),Object.defineProperty(c,"status",{get:function get(){return a.response.init.status}}),Object.defineProperty(c,"statusText",{get:function get(){return a.response.init.statusText}}),Object.defineProperty(c,"responseText",{get:function get(){return a.response.body}}),Object.defineProperty(c,"response",{get:function get(){switch(this.responseType){case"json":try{return JSON.parse(this.responseText)}catch(a){return null}case"document":return new DOMParser().parseFromString(this.responseText,"application/xml");default:return this.responseText;}}}),Object.defineProperty(c,"responseXML",{get:function get(){return this.response}}),c.onload&&c.onload(),c.onloadend&&c.onloadend(),c.onreadystatechange&&c.onreadystatechange()})):(this.customResponse=!1,g.call(this,b))},XMLHttpRequest.prototype.getAllResponseHeaders=function(){return this.customResponse?Object.keys(a.response.init.headers).reduce(function(b,c){return b.concat("".concat(c,": ").concat(a.response.init.headers[c],"\r\n"))},""):e.call(this)},XMLHttpRequest.prototype.getResponseHeader=function(b){return this.customResponse?a.response.init.headers[b.toLowerCase()]||null:f.call(this,b)},c.apply(this,arguments)};d.prototype=Object.create(c.prototype),d.prototype.tokensRenewed=function(a){this.retryFailedRequests(a)},d.prototype.serializeRequest=function(a){var b=this;return new Promise(function(c){new Request(a.xhr.url,{method:a.xhr.method,headers:a.xhr.headers,body:-1===["GET","HEAD"].indexOf(a.xhr.method.toUpperCase())&&a.body?a.body:void 0,credentials:a.xhr.withCredentials?"include":"omit"}).blob().then(function(a){return 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"),this.appAuthConfig.endpoints={authorization_endpoint:a.authorizationEndpoint,token_endpoint:a.tokenEndpoint,revocation_endpoint:a.revocationEndpoint,end_session_endpoint:a.endSessionEndpoint},window.addEventListener("message",function(a){if(a.origin===this.iframeOrigin)switch(a.data.message){case"appAuth-tokensAvailable":if(a.data.resourceServer)localStorage.removeItem("currentResourceServer"),this.renewTokenTimestamp=!1,this.pendingResourceServerRenewals.length&&this.pendingResourceServerRenewals.shift()(),this.identityProxy.tokensRenewed(a.data.resourceServer);else{var b=localStorage.getItem("originalWindowHash-"+this.appAuthConfig.clientId),c=!!window.location.hash.match(/&loggedin=true$/);null===b||""===b||"#"===b?history.replaceState(void 0,void 0,window.location.href.replace(/#&loggedin=true$/,"")):history.replaceState(void 0,void 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MessageChannel,this.identityProxyMessageChannel.port1.onmessage=this.handleIdentityProxyMessage.bind(this),b=Promise.all([new Promise(function(a){this.rsIframe.onload=function(){this.rsIframe.onload=null,a()}.bind(this)}.bind(this)),new Promise(function(a){this.appAuthIframe.onload=function(){this.appAuthIframe.onload=null;var b=new MessageChannel;b.port1.onmessage=a,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-config",config:this.appAuthConfig},this.iframeOrigin,[b.port2])}.bind(this)}.bind(this))]),document.getElementsByTagName("body")[0].appendChild(this.appAuthIframe),document.getElementsByTagName("body")[0].appendChild(this.rsIframe),b},handleIdentityProxyMessage:function handleIdentityProxyMessage(a){switch(a.data.message){case"makeRSRequest":this.rsIframe.contentWindow.postMessage({request:a.data.request,message:a.data.message,config:this.appAuthConfig},this.iframeOrigin,a.ports);break;case"renewTokens":this.renewTokens(a.data.resourceServer);}},getTokens:function getTokens(){this.appAuthIframe.contentWindow.postMessage({message:"appAuth-getAvailableData",config:this.appAuthConfig},this.iframeOrigin)},logout:function logout(a){return a=a||{},a.revoke_tokens=!1!==a.revoke_tokens,a.end_session=!1!==a.end_session,new Promise(function(b){this.logoutComplete=b,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-logout",config:this.appAuthConfig,options:a},this.iframeOrigin)}.bind(this))},whenRenewTokenFrameAvailable:function whenRenewTokenFrameAvailable(a){return new Promise(function(b){var c=localStorage.getItem("currentResourceServer");null===c&&(localStorage.setItem("currentResourceServer",a),c=a),a===c?b():this.pendingResourceServerRenewals.push(b)}.bind(this))},renewTokens:function renewTokens(a){this.whenRenewTokenFrameAvailable(a).then(function(){var b=new Date().getTime();localStorage.setItem("currentResourceServer",a),(!this.renewTokenTimestamp||this.renewTokenTimestamp+1e3*this.renewCooldownPeriod<b)&&(this.renewTokenTimestamp=b,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-getFreshAccessToken",config:this.appAuthConfig,resourceServer:a},this.iframeOrigin))}.bind(this))},registerIdentityProxy:function registerIdentityProxy(){return new Promise(function(a){if("serviceWorker"===this.identityProxyPreference&&"serviceWorker"in navigator){var b,c,d=function(){var c=navigator.serviceWorker.register(this.appAuthConfig.serviceWorkerUri);return c.then(function(c){b=c,navigator.serviceWorker.ready.then(function(){this.identityProxyMessageChannel.port1.onmessage=function(b){a(),this.handleIdentityProxyMessage.call(this,b)}.bind(this),c.active.postMessage({message:"configuration",resourceServers:Object.keys(this.appAuthConfig.resourceServers)},[this.identityProxyMessageChannel.port2])}.bind(this))}.bind(this)),c}.bind(this);d().then(function(){this.identityProxy={tokensRenewed:function tokensRenewed(a){navigator.serviceWorker.controller.postMessage({message:"tokensRenewed",resourceServer:a})}},c=setInterval(function(){b&&b.active?b.active.postMessage({message:"keepAlive"}):d().catch(function(){this.registerXHRProxy(),console.warn("Service worker failure, switching to XHR identity proxy"),clearInterval(c)}.bind(this))}.bind(this),1e3)}.bind(this)).catch(function(){this.registerXHRProxy(),c&&clearInterval(c),a()}.bind(this))}else this.registerXHRProxy(),a()}.bind(this))},registerXHRProxy:function registerXHRProxy(){if("undefined"!=typeof IdentityProxyXHR)this.identityProxy=new IdentityProxyXHR(Object.keys(this.appAuthConfig.resourceServers),this.identityProxyMessageChannel.port2);else throw"Browser incompatible with this build of AppAuthHelper. Use the legacy 'compatible' build instead."}}})()},{}],4:[function(a,b){window.Promise=window.Promise||("function"==typeof a("promise-polyfill")?a("promise-polyfill"):a("promise-polyfill").default),a("url-polyfill"),window.IdentityProxyXHR=a("./IdentityProxyXHR"),b.exports=a("./appAuthHelper")},{"./IdentityProxyXHR":2,"./appAuthHelper":3,"promise-polyfill":6,"url-polyfill":8}],5:[function(a,b){function c(){throw new Error("setTimeout has not been defined")}function d(){throw new Error("clearTimeout has not been defined")}function e(a){if(l===setTimeout)return setTimeout(a,0);if((l===c||!l)&&setTimeout)return l=setTimeout,setTimeout(a,0);try{return l(a,0)}catch(b){try{return l.call(null,a,0)}catch(b){return l.call(this,a,0)}}}function f(a){if(m===clearTimeout)return clearTimeout(a);if((m===d||!m)&&clearTimeout)return m=clearTimeout,clearTimeout(a);try{return m(a)}catch(b){try{return m.call(null,a)}catch(b){return m.call(this,a)}}}function 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MessageChannel,this.identityProxyMessageChannel.port1.onmessage=this.handleIdentityProxyMessage.bind(this),b=Promise.all([new Promise(function(a){this.rsIframe.onload=function(){this.rsIframe.onload=null,a()}.bind(this)}.bind(this)),new Promise(function(a){this.appAuthIframe.onload=function(){this.appAuthIframe.onload=null;var b=new MessageChannel;b.port1.onmessage=a,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-config",config:this.appAuthConfig},this.iframeOrigin,[b.port2])}.bind(this)}.bind(this))]),document.getElementsByTagName("body")[0].appendChild(this.appAuthIframe),document.getElementsByTagName("body")[0].appendChild(this.rsIframe),b},handleIdentityProxyMessage:function handleIdentityProxyMessage(a){switch(a.data.message){case"makeRSRequest":this.rsIframe.contentWindow.postMessage({request:a.data.request,message:a.data.message,config:this.appAuthConfig},this.iframeOrigin,a.ports);break;case"renewTokens":this.renewTokens(a.data.resourceServer);}},getTokens:function getTokens(){this.appAuthIframe.contentWindow.postMessage({message:"appAuth-getAvailableData",config:this.appAuthConfig},this.iframeOrigin)},logout:function logout(a){return a=a||{},a.revoke_tokens=!1!==a.revoke_tokens,a.end_session=!1!==a.end_session,new Promise(function(b){this.logoutComplete=b,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-logout",config:this.appAuthConfig,options:a},this.iframeOrigin)}.bind(this))},whenRenewTokenFrameAvailable:function whenRenewTokenFrameAvailable(a){return new Promise(function(b){var c=localStorage.getItem("currentResourceServer");null===c&&(localStorage.setItem("currentResourceServer",a),c=a),a===c?b():this.pendingResourceServerRenewals.push(b)}.bind(this))},renewTokens:function renewTokens(a){this.whenRenewTokenFrameAvailable(a).then(function(){var b=new Date().getTime();localStorage.setItem("currentResourceServer",a),(!this.renewTokenTimestamp||this.renewTokenTimestamp+1e3*this.renewCooldownPeriod<b)&&(this.renewTokenTimestamp=b,this.appAuthIframe.contentWindow.postMessage({message:"appAuth-getFreshAccessToken",config:this.appAuthConfig,resourceServer:a},this.iframeOrigin))}.bind(this))},registerIdentityProxy:function registerIdentityProxy(){return new Promise(function(a){if(this.identityProxy)return void a();if("serviceWorker"===this.identityProxyPreference&&"serviceWorker"in navigator){var b,c,d=function(){var c=navigator.serviceWorker.register(this.appAuthConfig.serviceWorkerUri);return c.then(function(c){b=c,navigator.serviceWorker.ready.then(function(){this.identityProxyMessageChannel.port1.onmessage=function(b){a(),this.handleIdentityProxyMessage.call(this,b)}.bind(this),c.active.postMessage({message:"configuration",resourceServers:Object.keys(this.appAuthConfig.resourceServers)},[this.identityProxyMessageChannel.port2])}.bind(this))}.bind(this)),c}.bind(this);d().then(function(){this.identityProxy={tokensRenewed:function tokensRenewed(a){navigator.serviceWorker.controller.postMessage({message:"tokensRenewed",resourceServer:a})}},c=setInterval(function(){b&&b.active?b.active.postMessage({message:"keepAlive"}):d().catch(function(){this.registerXHRProxy(),console.warn("Service worker failure, switching to XHR identity proxy"),clearInterval(c)}.bind(this))}.bind(this),1e3)}.bind(this)).catch(function(){this.registerXHRProxy(),c&&clearInterval(c),a()}.bind(this))}else this.registerXHRProxy(),a()}.bind(this))},registerXHRProxy:function registerXHRProxy(){if("undefined"!=typeof IdentityProxyXHR)this.identityProxy=new IdentityProxyXHR(Object.keys(this.appAuthConfig.resourceServers),this.identityProxyMessageChannel.port2);else throw"Browser incompatible with this build of AppAuthHelper. Use the legacy 'compatible' build instead."}}})()},{}],4:[function(a,b){window.Promise=window.Promise||("function"==typeof a("promise-polyfill")?a("promise-polyfill"):a("promise-polyfill").default),a("url-polyfill"),window.IdentityProxyXHR=a("./IdentityProxyXHR"),b.exports=a("./appAuthHelper")},{"./IdentityProxyXHR":2,"./appAuthHelper":3,"promise-polyfill":6,"url-polyfill":8}],5:[function(a,b){function c(){throw new Error("setTimeout has not been defined")}function d(){throw new Error("clearTimeout has not been defined")}function e(a){if(l===setTimeout)return setTimeout(a,0);if((l===c||!l)&&setTimeout)return l=setTimeout,setTimeout(a,0);try{return l(a,0)}catch(b){try{return l.call(null,a,0)}catch(b){return l.call(this,a,0)}}}function f(a){if(m===clearTimeout)return clearTimeout(a);if((m===d||!m)&&clearTimeout)return m=clearTimeout,clearTimeout(a);try{return m(a)}catch(b){try{return m.call(null,a)}catch(b){return m.call(this,a)}}}function 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