diff --git a/package-lock.json b/package-lock.json
index ea2edb24..36876610 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio-commons",
-  "version": "1.2.1-rc.5",
+  "version": "1.2.1-rc.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 719eb3f6..03f9ec7a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio-commons",
-  "version": "1.2.1-rc.5",
+  "version": "1.2.1-rc.7",
   "description": "Split Javascript SDK common components",
   "main": "cjs/index.js",
   "module": "esm/index.js",
diff --git a/src/sync/streaming/SSEClient/index.ts b/src/sync/streaming/SSEClient/index.ts
index 378ac9c0..7c0dfb6e 100644
--- a/src/sync/streaming/SSEClient/index.ts
+++ b/src/sync/streaming/SSEClient/index.ts
@@ -1,5 +1,6 @@
 import { IEventSourceConstructor } from '../../../services/types';
 import { ISettings } from '../../../types';
+import { isString } from '../../../utils/lang';
 import { IAuthTokenPushEnabled } from '../AuthClient/types';
 import { ISSEClient, ISseEventHandler } from './types';
 
@@ -15,7 +16,7 @@ const CONTROL_CHANNEL_REGEX = /^control_/;
  */
 function buildSSEHeaders(settings: ISettings) {
   const headers: Record<string, string> = {
-    SplitSDKClientKey: settings.core.authorizationKey.slice(-4),
+    SplitSDKClientKey: isString(settings.core.authorizationKey) ? settings.core.authorizationKey.slice(-4) : '',
     SplitSDKVersion: settings.version,
   };
 
diff --git a/src/sync/submitters/__tests__/eventsSyncTask.spec.ts b/src/sync/submitters/__tests__/eventsSyncTask.spec.ts
new file mode 100644
index 00000000..59b647c1
--- /dev/null
+++ b/src/sync/submitters/__tests__/eventsSyncTask.spec.ts
@@ -0,0 +1,61 @@
+import { eventsSyncTaskFactory } from '../eventsSyncTask';
+import { loggerMock } from '../../../logger/__tests__/sdkLogger.mock';
+
+
+
+describe('Events submitter (eventsSyncTask)', () => {
+
+  let __onFullQueueCb: () => void;
+  const postEventsBulkMock = jest.fn();
+  const eventsCacheMock = {
+    isEmpty: jest.fn(() => true),
+    setOnFullQueueCb: jest.fn(function (onFullQueueCb) { __onFullQueueCb = onFullQueueCb; })
+  };
+
+  beforeEach(() => {
+    eventsCacheMock.isEmpty.mockClear();
+  });
+
+  test('with eventsFirstPushWindow', async () => {
+    const eventsFirstPushWindow = 20; // @ts-ignore
+    const eventsSubmitter = eventsSyncTaskFactory(loggerMock, postEventsBulkMock, eventsCacheMock, 30000, eventsFirstPushWindow);
+
+    eventsSubmitter.start();
+    expect(eventsSubmitter.isRunning()).toEqual(true); // Submitter should be flagged as running
+    expect(eventsSubmitter.isExecuting()).toEqual(false); // but not executed immediatelly if there is a push window
+    expect(eventsCacheMock.isEmpty).not.toBeCalled();
+
+    // If queue is full, submitter should be executed
+    __onFullQueueCb();
+    expect(eventsSubmitter.isExecuting()).toEqual(true);
+    expect(eventsCacheMock.isEmpty).toBeCalledTimes(1);
+
+    // Await first push window
+    await new Promise(res => setTimeout(res, eventsFirstPushWindow + 10));
+    expect(eventsCacheMock.isEmpty).toBeCalledTimes(2); // after the push window, submitter should have been executed
+
+    expect(eventsSubmitter.isRunning()).toEqual(true);
+    eventsSubmitter.stop();
+    expect(eventsSubmitter.isRunning()).toEqual(false);
+  });
+
+  test('without eventsFirstPushWindow', async () => {
+    // @ts-ignore
+    const eventsSubmitter = eventsSyncTaskFactory(loggerMock, postEventsBulkMock, eventsCacheMock, 30000);
+
+    eventsSubmitter.start();
+    expect(eventsSubmitter.isRunning()).toEqual(true); // Submitter should be flagged as running
+    expect(eventsSubmitter.isExecuting()).toEqual(true); // and executes immediatelly if there isn't a push window
+    expect(eventsCacheMock.isEmpty).toBeCalledTimes(1);
+
+    // If queue is full, submitter should be executed
+    __onFullQueueCb();
+    expect(eventsSubmitter.isExecuting()).toEqual(true);
+    expect(eventsCacheMock.isEmpty).toBeCalledTimes(2);
+
+    expect(eventsSubmitter.isRunning()).toEqual(true);
+    eventsSubmitter.stop();
+    expect(eventsSubmitter.isRunning()).toEqual(false);
+  });
+
+});
diff --git a/src/sync/submitters/eventsSyncTask.ts b/src/sync/submitters/eventsSyncTask.ts
index b87ee24e..7c84374b 100644
--- a/src/sync/submitters/eventsSyncTask.ts
+++ b/src/sync/submitters/eventsSyncTask.ts
@@ -22,18 +22,25 @@ export function eventsSyncTaskFactory(
   // don't retry events.
   const syncTask = submitterSyncTaskFactory(log, postEventsBulk, eventsCache, eventsPushRate, DATA_NAME, latencyTracker);
 
-  // Set a timer for the first push of events,
+  // Set a timer for the first push window of events.
+  // Not implemented in the base submitter or sync task, since this feature is only used by the events submitter.
   if (eventsFirstPushWindow > 0) {
+    let running = false;
     let stopEventPublisherTimeout: ReturnType<typeof setTimeout>;
     const originalStart = syncTask.start;
     syncTask.start = () => {
+      running = true;
       stopEventPublisherTimeout = setTimeout(originalStart, eventsFirstPushWindow);
     };
     const originalStop = syncTask.stop;
     syncTask.stop = () => {
+      running = false;
       clearTimeout(stopEventPublisherTimeout);
       originalStop();
     };
+    syncTask.isRunning = () => {
+      return running;
+    };
   }
 
   // register events submitter to be executed when events cache is full
diff --git a/src/utils/settingsValidation/consent.ts b/src/utils/settingsValidation/consent.ts
index c68cf222..98b4112b 100644
--- a/src/utils/settingsValidation/consent.ts
+++ b/src/utils/settingsValidation/consent.ts
@@ -1,11 +1,12 @@
 import { ERROR_INVALID_CONFIG_PARAM } from '../../logger/constants';
 import { ILogger } from '../../logger/types';
+import { ConsentStatus } from '../../types';
 import { CONSENT_DECLINED, CONSENT_GRANTED, CONSENT_UNKNOWN } from '../constants';
 import { stringToUpperCase } from '../lang';
 
 const userConsentValues = [CONSENT_DECLINED, CONSENT_GRANTED, CONSENT_UNKNOWN];
 
-export function validateConsent({ userConsent, log }: { userConsent: any, log: ILogger }) {
+export function validateConsent({ userConsent, log }: { userConsent?: any, log: ILogger }): ConsentStatus {
   userConsent = stringToUpperCase(userConsent);
 
   if (userConsentValues.indexOf(userConsent) > -1) return userConsent;