diff --git a/amplitude.js b/amplitude.js
index 67780625..61185930 100644
--- a/amplitude.js
+++ b/amplitude.js
@@ -2062,7 +2062,9 @@ var logLevels = {
 var logLevel = logLevels.WARN;
 
 var setLogLevel = function setLogLevel(logLevelName) {
-  logLevel = logLevels[logLevelName] || logLevel;
+  if (logLevels.hasOwnProperty(logLevelName)) {
+    logLevel = logLevels[logLevelName];
+  }
 };
 
 var getLogLevel = function getLogLevel() {
@@ -2284,6 +2286,7 @@ var getQueryParam = function getQueryParam(name, query) {
 var utils = {
   setLogLevel: setLogLevel,
   getLogLevel: getLogLevel,
+  logLevels: logLevels,
   log: log,
   isEmptyString: isEmptyString,
   getQueryParam: getQueryParam,
diff --git a/amplitude.min.js b/amplitude.min.js
index 84526567..0c276b88 100644
--- a/amplitude.min.js
+++ b/amplitude.min.js
@@ -1 +1 @@
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e.getItem(t+this._storageSuffix)},Wn.prototype._getFromStorageLegacy=function(e,t){return e.getItem(t+this._legacyStorageSuffix)},Wn.prototype._setInStorage=function(e,t,n){e.setItem(t+this._storageSuffix,n)};var Qn=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if("object"!==U(t)&&(t=e.cookieStorage.get(e.options.cookieName+e._legacyStorageSuffix),!("object"===U(t)&&t.deviceId&&t.sessionId&&t.lastEventTime))){var n=function(e){var t=Z.getItem(e);return Z.removeItem(e),t},r="string"===U(e.options.apiKey)&&"_"+e.options.apiKey.slice(0,6)||"",o=n(y.DEVICE_ID+r),i=n(y.USER_ID+r),s=n(y.OPT_OUT+r);null!==s&&void 0!==s&&(s="true"===String(s));var a=parseInt(n(y.SESSION_ID)),u=parseInt(n(y.LAST_EVENT_TIME)),c=parseInt(n(y.LAST_EVENT_ID)),p=parseInt(n(y.LAST_IDENTIFY_ID)),l=parseInt(n(y.LAST_SEQUENCE_NUMBER)),f=function(e){return"object"===U(t)&&t[e]};e.options.deviceId=f("deviceId")||o,e.options.userId=f("userId")||i,e._sessionId=f("sessionId")||a||e._sessionId,e._lastEventTime=f("lastEventTime")||u||e._lastEventTime,e._eventId=f("eventId")||c||e._eventId,e._identifyId=f("identifyId")||p||e._identifyId,e._sequenceNumber=f("sequenceNumber")||l||e._sequenceNumber,e.options.optOut=s||!1,t&&void 0!==t.optOut&&null!==t.optOut&&(e.options.optOut="true"===String(t.optOut)),Zn(e)}},Xn=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if("object"===U(t))Hn(e,t);else{var 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n=e?"?"+e.split(".").slice(-1)[0].replace(/\|/g,"&"):"",r=function(e,t,n,r){return G.getQueryParam(e,t)||G.getQueryParam(n,r)},o=r(y.UTM_SOURCE,t,"utmcsr",n),i=r(y.UTM_MEDIUM,t,"utmcmd",n),s=r(y.UTM_CAMPAIGN,t,"utmccn",n),a=r(y.UTM_TERM,t,"utmctr",n),u=r(y.UTM_CONTENT,t,"utmcct",n),c={},p=function(e,t){G.isEmptyString(t)||(c[e]=t)};return p(y.UTM_SOURCE,o),p(y.UTM_MEDIUM,i),p(y.UTM_CAMPAIGN,s),p(y.UTM_TERM,a),p(y.UTM_CONTENT,u),c}(t=t||this.cookieStorage.get("__utmz"),e);er(this,n)},Wn.prototype._unsetUTMParams=function(){var e=new te;e.unset(y.REFERRER),e.unset(y.UTM_SOURCE),e.unset(y.UTM_MEDIUM),e.unset(y.UTM_CAMPAIGN),e.unset(y.UTM_TERM),e.unset(y.UTM_CONTENT),this.identify(e)};var er=function(e,t){if("object"===U(t)&&0!==Object.keys(t).length){var n=new te;for(var r in t)t.hasOwnProperty(r)&&(n.setOnce("initial_"+r,t[r]),n.set(r,t[r]));e.identify(n)}};Wn.prototype._getReferrer=function(){return document.referrer},Wn.prototype._getUrlParams=function(){return location.search},Wn.prototype._saveGclid=function(e){var t=G.getQueryParam("gclid",e);if(!G.isEmptyString(t)){er(this,{gclid:t})}},Wn.prototype._getDeviceIdFromUrlParam=function(e){return G.getQueryParam(y.AMP_DEVICE_ID_PARAM,e)},Wn.prototype._getReferringDomain=function(e){if(G.isEmptyString(e))return null;var t=e.split("/");return t.length>=3?t[2]:null},Wn.prototype._saveReferrer=function(e){if(!G.isEmptyString(e)){var t={referrer:e,referring_domain:this._getReferringDomain(e)};er(this,t)}},Wn.prototype.saveEvents=function(){try{this._setInStorage(Z,this.options.unsentKey,JSON.stringify(this._unsentEvents))}catch(e){}try{this._setInStorage(Z,this.options.unsentIdentifyKey,JSON.stringify(this._unsentIdentifys))}catch(e){}},Wn.prototype.setDomain=function(e){if(G.validateInput(e,"domain","string"))try{this.cookieStorage.options({domain:e}),this.options.domain=this.cookieStorage.options().domain,Xn(this),Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setUserId=function(e){try{this.options.userId=void 0!==e&&null!==e&&""+e||null,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setGroup=function(e,t){if(this._apiKeySet("setGroup()")&&G.validateInput(e,"groupType","string")&&!G.isEmptyString(e)){var n={};n[e]=t;var r=(new te).set(e,t);this._logEvent(y.IDENTIFY_EVENT,null,null,r.userPropertiesOperations,n,null,null,null)}},Wn.prototype.setOptOut=function(e){if(G.validateInput(e,"enable","boolean"))try{this.options.optOut=e,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setSessionId=function(e){if(G.validateInput(e,"sessionId","number"))try{this._sessionId=e,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.resetSessionId=function(){this.setSessionId((new Date).getTime())},Wn.prototype.regenerateDeviceId=function(){this.setDeviceId($n()+"R")},Wn.prototype.setDeviceId=function(e){if(G.validateInput(e,"deviceId","string"))try{G.isEmptyString(e)||(this.options.deviceId=""+e,Zn(this))}catch(e){G.log.error(e)}},Wn.prototype.setUserProperties=function(e){if(this._apiKeySet("setUserProperties()")&&G.validateInput(e,"userProperties","object")){var t=G.truncate(G.validateProperties(e));if(0!==Object.keys(t).length){var n=new te;for(var r in 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t=(this.options.forceHttps?"https":"https:"===window.location.protocol?"https":"http")+"://"+this.options.apiEndpoint+"/",n=Math.min(this._unsentCount(),this.options.uploadBatchSize),r=this._mergeEventsAndIdentifys(n),o=r.maxEventId,i=r.maxIdentifyId,s=JSON.stringify(r.eventsToSend),a=(new Date).getTime(),u={client:this.options.apiKey,e:s,v:y.API_VERSION,upload_time:a,checksum:ne(y.API_VERSION+this.options.apiKey+s+a)},c=this;new Gn(t,u).send(function(t,r){c._sending=!1;try{200===t&&"success"===r?(c.removeEvents(o,i),c.options.saveEvents&&c.saveEvents(),c._sendEventsIfReady(e)||"function"!==U(e)||e(t,r)):413===t?(1===c.options.uploadBatchSize&&c.removeEvents(o,i),c.options.uploadBatchSize=Math.ceil(n/2),c.sendEvents(e)):"function"===U(e)&&e(t,r)}catch(e){}})}else"function"===U(e)&&e(0,"No request sent",{reason:"No events to send"});else"function"===U(e)&&e(0,"No request sent",{reason:"API key not set"})},Wn.prototype._mergeEventsAndIdentifys=function(e){for(var 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Please set a valid apiKey with init() before calling "+e),!1)},Wn.prototype._loadSavedUnsentEvents=function(e){var t=this._getFromStorage(Z,e),n=this._parseSavedUnsentEventsString(t,e),r=this._getFromStorageLegacy(Z,e),o=this._parseSavedUnsentEventsString(r,e).concat(n);return this._removeFromLegacyStorage(Z,e),this._setInStorage(Z,e,JSON.stringify(o)),o},Wn.prototype._removeFromLegacyStorage=function(e,t){e.removeItem(t+this._legacyStorageSuffix)},Wn.prototype._parseSavedUnsentEventsString=function(e,t){if(G.isEmptyString(e))return[];if("string"===U(e))try{var n=JSON.parse(e);if("array"===U(n))return n}catch(e){}return G.log.error("Unable to load "+t+" events. Restart with a new empty queue."),[]},Wn.prototype.isNewSession=function(){return this._newSession},Wn.prototype.getSessionId=function(){return this._sessionId},Wn.prototype.nextEventId=function(){return this._eventId++,this._eventId},Wn.prototype.nextIdentifyId=function(){return this._identifyId++,this._identifyId},Wn.prototype.nextSequenceNumber=function(){return this._sequenceNumber++,this._sequenceNumber},Wn.prototype._unsentCount=function(){return this._unsentEvents.length+this._unsentIdentifys.length},Wn.prototype._sendEventsIfReady=function(e){return 0!==this._unsentCount()&&(this.options.batchEvents?this._unsentCount()>=this.options.eventUploadThreshold?(this.sendEvents(e),!0):(this._updateScheduled||(this._updateScheduled=!0,setTimeout(function(){this._updateScheduled=!1,this.sendEvents()}.bind(this),this.options.eventUploadPeriodMillis)),!1):(this.sendEvents(e),!0))},Wn.prototype._getFromStorage=function(e,t){return e.getItem(t+this._storageSuffix)},Wn.prototype._getFromStorageLegacy=function(e,t){return e.getItem(t+this._legacyStorageSuffix)},Wn.prototype._setInStorage=function(e,t,n){e.setItem(t+this._storageSuffix,n)};var Qn=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if("object"!==U(t)&&(t=e.cookieStorage.get(e.options.cookieName+e._legacyStorageSuffix),!("object"===U(t)&&t.deviceId&&t.sessionId&&t.lastEventTime))){var n=function(e){var t=Z.getItem(e);return Z.removeItem(e),t},r="string"===U(e.options.apiKey)&&"_"+e.options.apiKey.slice(0,6)||"",o=n(y.DEVICE_ID+r),i=n(y.USER_ID+r),s=n(y.OPT_OUT+r);null!==s&&void 0!==s&&(s="true"===String(s));var a=parseInt(n(y.SESSION_ID)),u=parseInt(n(y.LAST_EVENT_TIME)),c=parseInt(n(y.LAST_EVENT_ID)),p=parseInt(n(y.LAST_IDENTIFY_ID)),l=parseInt(n(y.LAST_SEQUENCE_NUMBER)),f=function(e){return"object"===U(t)&&t[e]};e.options.deviceId=f("deviceId")||o,e.options.userId=f("userId")||i,e._sessionId=f("sessionId")||a||e._sessionId,e._lastEventTime=f("lastEventTime")||u||e._lastEventTime,e._eventId=f("eventId")||c||e._eventId,e._identifyId=f("identifyId")||p||e._identifyId,e._sequenceNumber=f("sequenceNumber")||l||e._sequenceNumber,e.options.optOut=s||!1,t&&void 0!==t.optOut&&null!==t.optOut&&(e.options.optOut="true"===String(t.optOut)),Zn(e)}},Xn=function(e){var t=e.cookieStorage.get(e.options.cookieName+e._storageSuffix);if("object"===U(t))Hn(e,t);else{var n=e.cookieStorage.get(e.options.cookieName+e._legacyStorageSuffix);"object"===U(n)&&(e.cookieStorage.remove(e.options.cookieName+e._legacyStorageSuffix),Hn(e,n))}},Hn=function(e,t){t.deviceId&&(e.options.deviceId=t.deviceId),t.userId&&(e.options.userId=t.userId),null!==t.optOut&&void 0!==t.optOut&&(e.options.optOut=t.optOut),t.sessionId&&(e._sessionId=parseInt(t.sessionId)),t.lastEventTime&&(e._lastEventTime=parseInt(t.lastEventTime)),t.eventId&&(e._eventId=parseInt(t.eventId)),t.identifyId&&(e._identifyId=parseInt(t.identifyId)),t.sequenceNumber&&(e._sequenceNumber=parseInt(t.sequenceNumber))},Zn=function(e){e.cookieStorage.set(e.options.cookieName+e._storageSuffix,{deviceId:e.options.deviceId,userId:e.options.userId,optOut:e.options.optOut,sessionId:e._sessionId,lastEventTime:e._lastEventTime,eventId:e._eventId,identifyId:e._identifyId,sequenceNumber:e._sequenceNumber})};Wn.prototype._initUtmData=function(e,t){e=e||this._getUrlParams();var n=function(e,t){var n=e?"?"+e.split(".").slice(-1)[0].replace(/\|/g,"&"):"",r=function(e,t,n,r){return G.getQueryParam(e,t)||G.getQueryParam(n,r)},o=r(y.UTM_SOURCE,t,"utmcsr",n),i=r(y.UTM_MEDIUM,t,"utmcmd",n),s=r(y.UTM_CAMPAIGN,t,"utmccn",n),a=r(y.UTM_TERM,t,"utmctr",n),u=r(y.UTM_CONTENT,t,"utmcct",n),c={},p=function(e,t){G.isEmptyString(t)||(c[e]=t)};return p(y.UTM_SOURCE,o),p(y.UTM_MEDIUM,i),p(y.UTM_CAMPAIGN,s),p(y.UTM_TERM,a),p(y.UTM_CONTENT,u),c}(t=t||this.cookieStorage.get("__utmz"),e);er(this,n)},Wn.prototype._unsetUTMParams=function(){var e=new te;e.unset(y.REFERRER),e.unset(y.UTM_SOURCE),e.unset(y.UTM_MEDIUM),e.unset(y.UTM_CAMPAIGN),e.unset(y.UTM_TERM),e.unset(y.UTM_CONTENT),this.identify(e)};var er=function(e,t){if("object"===U(t)&&0!==Object.keys(t).length){var n=new te;for(var r in t)t.hasOwnProperty(r)&&(n.setOnce("initial_"+r,t[r]),n.set(r,t[r]));e.identify(n)}};Wn.prototype._getReferrer=function(){return document.referrer},Wn.prototype._getUrlParams=function(){return location.search},Wn.prototype._saveGclid=function(e){var t=G.getQueryParam("gclid",e);if(!G.isEmptyString(t)){er(this,{gclid:t})}},Wn.prototype._getDeviceIdFromUrlParam=function(e){return G.getQueryParam(y.AMP_DEVICE_ID_PARAM,e)},Wn.prototype._getReferringDomain=function(e){if(G.isEmptyString(e))return null;var t=e.split("/");return t.length>=3?t[2]:null},Wn.prototype._saveReferrer=function(e){if(!G.isEmptyString(e)){var t={referrer:e,referring_domain:this._getReferringDomain(e)};er(this,t)}},Wn.prototype.saveEvents=function(){try{this._setInStorage(Z,this.options.unsentKey,JSON.stringify(this._unsentEvents))}catch(e){}try{this._setInStorage(Z,this.options.unsentIdentifyKey,JSON.stringify(this._unsentIdentifys))}catch(e){}},Wn.prototype.setDomain=function(e){if(G.validateInput(e,"domain","string"))try{this.cookieStorage.options({domain:e}),this.options.domain=this.cookieStorage.options().domain,Xn(this),Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setUserId=function(e){try{this.options.userId=void 0!==e&&null!==e&&""+e||null,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setGroup=function(e,t){if(this._apiKeySet("setGroup()")&&G.validateInput(e,"groupType","string")&&!G.isEmptyString(e)){var n={};n[e]=t;var r=(new te).set(e,t);this._logEvent(y.IDENTIFY_EVENT,null,null,r.userPropertiesOperations,n,null,null,null)}},Wn.prototype.setOptOut=function(e){if(G.validateInput(e,"enable","boolean"))try{this.options.optOut=e,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.setSessionId=function(e){if(G.validateInput(e,"sessionId","number"))try{this._sessionId=e,Zn(this)}catch(e){G.log.error(e)}},Wn.prototype.resetSessionId=function(){this.setSessionId((new Date).getTime())},Wn.prototype.regenerateDeviceId=function(){this.setDeviceId($n()+"R")},Wn.prototype.setDeviceId=function(e){if(G.validateInput(e,"deviceId","string"))try{G.isEmptyString(e)||(this.options.deviceId=""+e,Zn(this))}catch(e){G.log.error(e)}},Wn.prototype.setUserProperties=function(e){if(this._apiKeySet("setUserProperties()")&&G.validateInput(e,"userProperties","object")){var t=G.truncate(G.validateProperties(e));if(0!==Object.keys(t).length){var n=new te;for(var r in t)t.hasOwnProperty(r)&&n.set(r,t[r]);this.identify(n)}}},Wn.prototype.clearUserProperties=function(){if(this._apiKeySet("clearUserProperties()")){var e=new te;e.clearAll(),this.identify(e)}};var tr=function(e,t){for(var n=0;n<t._q.length;n++){var r=e[t._q[n][0]];"function"===U(r)&&r.apply(e,t._q[n].slice(1))}return e};Wn.prototype.identify=function(e,t){if(this._apiKeySet("identify()"))if("object"===U(e)&&e.hasOwnProperty("_q")&&(e=tr(new te,e)),e instanceof te){if(Object.keys(e.userPropertiesOperations).length>0)return this._logEvent(y.IDENTIFY_EVENT,null,null,e.userPropertiesOperations,null,null,null,t);"function"===U(t)&&t(0,"No request sent",{reason:"No user property operations"})}else G.log.error("Invalid identify input type. Expected Identify object but saw "+U(e)),"function"===U(t)&&t(0,"No request sent",{reason:"Invalid identify input type"});else"function"===U(t)&&t(0,"No request sent",{reason:"API key is not set"})},Wn.prototype.groupIdentify=function(e,t,n,r){if(this._apiKeySet("groupIdentify()"))if(G.validateInput(e,"group_type","string")&&!G.isEmptyString(e))if(null!==t&&void 0!==t)if("object"===U(n)&&n.hasOwnProperty("_q")&&(n=tr(new te,n)),n instanceof te){if(Object.keys(n.userPropertiesOperations).length>0)return this._logEvent(y.GROUP_IDENTIFY_EVENT,null,null,null,function(e,t,n){return t in e?Object.defineProperty(e,t,{value:n,enumerable:!0,configurable:!0,writable:!0}):e[t]=n,e}({},e,t),n.userPropertiesOperations,null,r);"function"===U(r)&&r(0,"No request sent",{reason:"No group property operations"})}else G.log.error("Invalid identify input type. Expected Identify object but saw "+U(n)),"function"===U(r)&&r(0,"No request sent",{reason:"Invalid identify input type"});else"function"===U(r)&&r(0,"No request sent",{reason:"Invalid group name"});else"function"===U(r)&&r(0,"No request sent",{reason:"Invalid group type"});else"function"===U(r)&&r(0,"No request sent",{reason:"API key is not set"})},Wn.prototype.setVersionName=function(e){G.validateInput(e,"versionName","string")&&(this.options.versionName=e)},Wn.prototype._logEvent=function(e,t,n,r,o,i,s,a){if(Xn(this),e)if(this.options.optOut)"function"===U(a)&&a(0,"No request sent",{reason:"optOut is set to true"});else try{var u;u=e===y.IDENTIFY_EVENT||e===y.GROUP_IDENTIFY_EVENT?this.nextIdentifyId():this.nextEventId();var c=this.nextSequenceNumber(),p="number"===U(s)?s:(new Date).getTime();(!this._sessionId||!this._lastEventTime||p-this._lastEventTime>this.options.sessionTimeout)&&(this._sessionId=p),this._lastEventTime=p,Zn(this),r=r||{};var l=qn({},this._apiPropertiesTrackingOptions);n=qn(l,n||{}),t=t||{},o=o||{},i=i||{};var f={device_id:this.options.deviceId,user_id:this.options.userId,timestamp:p,event_id:u,session_id:this._sessionId||-1,event_type:e,version_name:nr(this,"version_name")?this.options.versionName||null:null,platform:nr(this,"platform")?this.options.platform:null,os_name:nr(this,"os_name")?this._ua.browser.name||null:null,os_version:nr(this,"os_version")?this._ua.browser.major||null:null,device_model:nr(this,"device_model")?this._ua.os.name||null:null,language:nr(this,"language")?this.options.language:null,api_properties:n,event_properties:G.truncate(G.validateProperties(t)),user_properties:G.truncate(G.validateProperties(r)),uuid:$n(),library:{name:"amplitude-js",version:"4.5.2"},sequence_number:c,groups:G.truncate(G.validateGroups(o)),group_properties:G.truncate(G.validateProperties(i)),user_agent:this._userAgent};return e===y.IDENTIFY_EVENT||e===y.GROUP_IDENTIFY_EVENT?(this._unsentIdentifys.push(f),this._limitEventsQueued(this._unsentIdentifys)):(this._unsentEvents.push(f),this._limitEventsQueued(this._unsentEvents)),this.options.saveEvents&&this.saveEvents(),this._sendEventsIfReady(a)||"function"!==U(a)||a(0,"No request sent",{reason:"No events to send or upload queued"}),u}catch(e){G.log.error(e)}else"function"===U(a)&&a(0,"No request sent",{reason:"Missing eventType"})};var nr=function(e,t){return!!e.options.trackingOptions[t]},rr=function(e){for(var t=["city","country","dma","ip_address","region"],n={},r=0;r<t.length;r++){var o=t[r];nr(e,o)||(n[o]=!1)}return n};Wn.prototype._limitEventsQueued=function(e){e.length>this.options.savedMaxCount&&e.splice(0,e.length-this.options.savedMaxCount)},Wn.prototype.logEvent=function(e,t,n){return this.logEventWithTimestamp(e,t,null,n)},Wn.prototype.logEventWithTimestamp=function(e,t,n,r){return this._apiKeySet("logEvent()")?G.validateInput(e,"eventType","string")?G.isEmptyString(e)?("function"===U(r)&&r(0,"No request sent",{reason:"Missing eventType"}),-1):this._logEvent(e,t,null,null,null,null,n,r):("function"===U(r)&&r(0,"No request sent",{reason:"Invalid type for eventType"}),-1):("function"===U(r)&&r(0,"No request sent",{reason:"API key not set"}),-1)},Wn.prototype.logEventWithGroups=function(e,t,n,r){return this._apiKeySet("logEventWithGroups()")?G.validateInput(e,"eventType","string")?this._logEvent(e,t,null,null,n,null,null,r):("function"===U(r)&&r(0,"No request sent",{reason:"Invalid type for eventType"}),-1):("function"===U(r)&&r(0,"No request sent",{reason:"API key not set"}),-1)};var or=function(e){return!isNaN(parseFloat(e))&&isFinite(e)};Wn.prototype.logRevenueV2=function(e){if(this._apiKeySet("logRevenueV2()"))if("object"===U(e)&&e.hasOwnProperty("_q")&&(e=tr(new Bn,e)),e instanceof Bn){if(e&&e._isValidRevenue())return this.logEvent(y.REVENUE_EVENT,e._toJSONObject())}else G.log.error("Invalid revenue input type. Expected Revenue object but saw "+U(e))},Wn.prototype.logRevenue=function(e,t,n){return this._apiKeySet("logRevenue()")&&or(e)&&(void 0===t||or(t))?this._logEvent(y.REVENUE_EVENT,{},{productId:n,special:"revenue_amount",quantity:t||1,price:e},null,null,null,null,null):-1},Wn.prototype.removeEvents=function(e,t){ir(this,"_unsentEvents",e),ir(this,"_unsentIdentifys",t)};var ir=function(e,t,n){if(!(n<0)){for(var r=[],o=0;o<e[t].length;o++)e[t][o].event_id>n&&r.push(e[t][o]);e[t]=r}};Wn.prototype.sendEvents=function(e){if(this._apiKeySet("sendEvents()"))if(this.options.optOut)"function"===U(e)&&e(0,"No request sent",{reason:"optOut is set to true"});else if(0!==this._unsentCount())if(this._sending)"function"===U(e)&&e(0,"No request sent",{reason:"Request already in progress"});else{this._sending=!0;var t=(this.options.forceHttps?"https":"https:"===window.location.protocol?"https":"http")+"://"+this.options.apiEndpoint+"/",n=Math.min(this._unsentCount(),this.options.uploadBatchSize),r=this._mergeEventsAndIdentifys(n),o=r.maxEventId,i=r.maxIdentifyId,s=JSON.stringify(r.eventsToSend),a=(new Date).getTime(),u={client:this.options.apiKey,e:s,v:y.API_VERSION,upload_time:a,checksum:ne(y.API_VERSION+this.options.apiKey+s+a)},c=this;new Gn(t,u).send(function(t,r){c._sending=!1;try{200===t&&"success"===r?(c.removeEvents(o,i),c.options.saveEvents&&c.saveEvents(),c._sendEventsIfReady(e)||"function"!==U(e)||e(t,r)):413===t?(1===c.options.uploadBatchSize&&c.removeEvents(o,i),c.options.uploadBatchSize=Math.ceil(n/2),c.sendEvents(e)):"function"===U(e)&&e(t,r)}catch(e){}})}else"function"===U(e)&&e(0,"No request sent",{reason:"No events to send"});else"function"===U(e)&&e(0,"No request sent",{reason:"API key not set"})},Wn.prototype._mergeEventsAndIdentifys=function(e){for(var t=[],n=0,r=-1,o=0,i=-1;t.length<e;){var s,a=o>=this._unsentIdentifys.length,u=n>=this._unsentEvents.length;if(u&&a){G.log.error("Merging Events and Identifys, less events and identifys than expected");break}a?r=(s=this._unsentEvents[n++]).event_id:u?i=(s=this._unsentIdentifys[o++]).event_id:!("sequence_number"in this._unsentEvents[n])||this._unsentEvents[n].sequence_number<this._unsentIdentifys[o].sequence_number?r=(s=this._unsentEvents[n++]).event_id:i=(s=this._unsentIdentifys[o++]).event_id,t.push(s)}return{eventsToSend:t,maxEventId:r,maxIdentifyId:i}},Wn.prototype.setGlobalUserProperties=function(e){this.setUserProperties(e)},Wn.prototype.__VERSION__="4.5.2";var sr=xt(Object.keys,Object),ar=Object.prototype.hasOwnProperty,ur=function(e){if(!Rt(e))return sr(e);var t=[];for(var n in Object(e))ar.call(e,n)&&"constructor"!=n&&t.push(n);return t},cr=function(e){return $t(e)?_n(e):ur(e)},pr=Object.prototype.hasOwnProperty,lr=Dn(function(e,t){if(Rt(t)||$t(t))fn(t,cr(t),e);else for(var n in t)pr.call(t,n)&&ln(e,n,t[n])}),fr=function(){this.options=lr({},Jn),this._q=[],this._instances={}};fr.prototype.Identify=te,fr.prototype.Revenue=Bn,fr.prototype.getInstance=function(e){e=G.isEmptyString(e)?y.DEFAULT_INSTANCE:e.toLowerCase();var t=this._instances[e];return void 0===t&&(t=new Wn(e),this._instances[e]=t),t},fr.prototype.init=function(e,t,n,r){this.getInstance().init(e,t,n,function(e){this.options=e.options,"function"===U(r)&&r(e)}.bind(this))},fr.prototype.runQueuedFunctions=function(){for(var e=0;e<this._q.length;e++){var t=this[this._q[e][0]];"function"===U(t)&&t.apply(this,this._q[e].slice(1))}this._q=[];for(var n in this._instances)this._instances.hasOwnProperty(n)&&this._instances[n].runQueuedFunctions()},fr.prototype.isNewSession=function(){return this.getInstance().isNewSession()},fr.prototype.getSessionId=function(){return this.getInstance().getSessionId()},fr.prototype.nextEventId=function(){return this.getInstance().nextEventId()},fr.prototype.nextIdentifyId=function(){return this.getInstance().nextIdentifyId()},fr.prototype.nextSequenceNumber=function(){return this.getInstance().nextSequenceNumber()},fr.prototype.saveEvents=function(){this.getInstance().saveEvents()},fr.prototype.setDomain=function(e){this.getInstance().setDomain(e)},fr.prototype.setUserId=function(e){this.getInstance().setUserId(e)},fr.prototype.setGroup=function(e,t){this.getInstance().setGroup(e,t)},fr.prototype.setOptOut=function(e){this.getInstance().setOptOut(e)},fr.prototype.regenerateDeviceId=function(){this.getInstance().regenerateDeviceId()},fr.prototype.setDeviceId=function(e){this.getInstance().setDeviceId(e)},fr.prototype.setUserProperties=function(e){this.getInstance().setUserProperties(e)},fr.prototype.clearUserProperties=function(){this.getInstance().clearUserProperties()},fr.prototype.identify=function(e,t){this.getInstance().identify(e,t)},fr.prototype.setVersionName=function(e){this.getInstance().setVersionName(e)},fr.prototype.logEvent=function(e,t,n){return this.getInstance().logEvent(e,t,n)},fr.prototype.logEventWithGroups=function(e,t,n,r){return this.getInstance().logEventWithGroups(e,t,n,r)},fr.prototype.logRevenueV2=function(e){return this.getInstance().logRevenueV2(e)},fr.prototype.logRevenue=function(e,t,n){return this.getInstance().logRevenue(e,t,n)},fr.prototype.removeEvents=function(e,t){this.getInstance().removeEvents(e,t)},fr.prototype.sendEvents=function(e){this.getInstance().sendEvents(e)},fr.prototype.setGlobalUserProperties=function(e){this.getInstance().setUserProperties(e)},fr.prototype.__VERSION__="4.5.2";var dr=window.amplitude||{},hr=new fr;hr._q=dr._q||[];for(var gr in dr._iq)dr._iq.hasOwnProperty(gr)&&(hr.getInstance(gr)._q=dr._iq[gr]._q||[]);return hr});
diff --git a/src/utils.js b/src/utils.js
index 67273239..1f715be7 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -11,7 +11,9 @@ var logLevels = {
 let logLevel = logLevels.WARN;
 
 const setLogLevel = function setLogLevel(logLevelName) {
-  logLevel = logLevels[logLevelName] || logLevel;
+  if (logLevels.hasOwnProperty(logLevelName)) {
+    logLevel = logLevels[logLevelName];
+  }
 };
 
 const getLogLevel = function getLogLevel() {
@@ -236,6 +238,7 @@ var getQueryParam = function getQueryParam(name, query) {
 export default {
   setLogLevel,
   getLogLevel,
+  logLevels,
   log,
   isEmptyString,
   getQueryParam,
diff --git a/test/utils.js b/test/utils.js
index 7b66b78e..270c6cce 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -14,6 +14,33 @@ describe('utils', function() {
     });
   });
 
+  describe('setLogLevel', function() {
+    afterEach(() => {
+      utils.setLogLevel('WARN');
+    });
+
+    it('can set log level to DISABLE', function() {
+      utils.setLogLevel('DISABLE');
+      assert.strictEqual(utils.getLogLevel(), utils.logLevels.DISABLE);
+    });
+
+    it('can set log level to ERROR', () => {
+      utils.setLogLevel('ERROR');
+      assert.strictEqual(utils.getLogLevel(), utils.logLevels.ERROR);
+    });
+
+    it('can set log level to WARN', () => {
+      utils.setLogLevel('DISABLE');
+      utils.setLogLevel('WARN');
+      assert.strictEqual(utils.getLogLevel(), utils.logLevels.WARN);
+    });
+
+    it('can set log level to INFO', () => {
+      utils.setLogLevel('INFO');
+      assert.strictEqual(utils.getLogLevel(), utils.logLevels.INFO);
+    });
+  });
+
   describe('log', function() {
     beforeEach(function() {
       utils.setLogLevel('INFO');