diff --git a/CHANGES.txt b/CHANGES.txt
index cb625471..00388146 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,4 @@
-1.4.0 (May 23, 2022)
+1.4.0 (May 24, 2022)
  - Added `scheduler.telemetryRefreshRate` property to SDK configuration, and deprecated `scheduler.metricsRefreshRate` property.
  - Updated SDK telemetry storage, metrics and updater to be more effective and send less often.
  - Bugfixing - Updated default values for `scheduler.impressionsRefreshRate` config parameter: 300s for OPTIMIZED impression mode and 60s for DEBUG impression mode.
diff --git a/src/utils/lang/index.ts b/src/utils/lang/index.ts
index bd7c7a51..0a828dda 100644
--- a/src/utils/lang/index.ts
+++ b/src/utils/lang/index.ts
@@ -71,7 +71,7 @@ export function forOwn<T>(obj: { [key: string]: T }, iteratee: (value: T, key: s
  * Safely retrieve the specified prop from obj. If we can't retrieve
  * that property value, we return the default value.
  */
-export function get(obj: any, prop: any, val: any): any {
+export function get(obj: any, prop: any, val?: any): any {
   let res = val;
 
   try { // No risks nor lots of checks.
diff --git a/src/utils/settingsValidation/__tests__/index.spec.ts b/src/utils/settingsValidation/__tests__/index.spec.ts
index 5191d546..e82d1d99 100644
--- a/src/utils/settingsValidation/__tests__/index.spec.ts
+++ b/src/utils/settingsValidation/__tests__/index.spec.ts
@@ -42,32 +42,36 @@ describe('settingsValidation', () => {
     expect(settings.sync.impressionsMode).toBe(OPTIMIZED);
   });
 
-  test('override with defaults', () => {
-    const settings = settingsValidation({
-      core: {
-        authorizationKey: 'dummy token'
-      },
-      sync: {
-        impressionsMode: 'some',
-      }
-    }, minimalSettingsParams);
+  test('override with default impressionMode if provided one is invalid', () => {
+    const config = {
+      core: { authorizationKey: 'dummy token' },
+      sync: { impressionsMode: 'some' }
+    };
+    let settings = settingsValidation(config, minimalSettingsParams);
 
     expect(settings.sync.impressionsMode).toBe(OPTIMIZED);
-    expect(settings.scheduler.impressionsRefreshRate).toBe(300000);
+    expect(settings.scheduler.impressionsRefreshRate).toBe(300000); // Default
+
+    settings = settingsValidation({ ...config, scheduler: { impressionsRefreshRate: 10 } }, minimalSettingsParams);
+
+    expect(settings.sync.impressionsMode).toBe(OPTIMIZED);
+    expect(settings.scheduler.impressionsRefreshRate).toBe(10000);
   });
 
   test('impressionsMode should be configurable', () => {
-    const settings = settingsValidation({
-      core: {
-        authorizationKey: 'dummy token'
-      },
-      sync: {
-        impressionsMode: DEBUG
-      }
-    }, minimalSettingsParams);
+    const config = {
+      core: { authorizationKey: 'dummy token' },
+      sync: { impressionsMode: DEBUG }
+    };
+    let settings = settingsValidation(config, minimalSettingsParams);
 
     expect(settings.sync.impressionsMode).toEqual(DEBUG);
     expect(settings.scheduler.impressionsRefreshRate).toBe(60000); // Different default for DEBUG impressionsMode
+
+    settings = settingsValidation({ ...config, scheduler: { impressionsRefreshRate: 10 } }, minimalSettingsParams);
+
+    expect(settings.sync.impressionsMode).toBe(DEBUG);
+    expect(settings.scheduler.impressionsRefreshRate).toBe(10000);
   });
 
   test('urls should be configurable', () => {
@@ -246,17 +250,18 @@ describe('settingsValidation', () => {
     expect(settings.core.trafficType).toEqual(true); // traffic type is ignored
   });
 
-  test('validate min values', () => {
-    const settings = settingsValidation({
-      scheduler: {
-        telemetryRefreshRate: 0,
-        impressionsRefreshRate: 'invalid',
-      }
-    }, minimalSettingsParams);
-
-    expect(settings.scheduler.telemetryRefreshRate).toBe(60000);
-    expect(settings.scheduler.impressionsRefreshRate).toBe(60000);
-  });
+  // Not implemented yet
+  // test('validate min values', () => {
+  //   const settings = settingsValidation({
+  //     scheduler: {
+  //       telemetryRefreshRate: 0,
+  //       impressionsRefreshRate: 'invalid',
+  //     }
+  //   }, minimalSettingsParams);
+
+  //   expect(settings.scheduler.telemetryRefreshRate).toBe(60000);
+  //   expect(settings.scheduler.impressionsRefreshRate).toBe(60000);
+  // });
 
 });
 
diff --git a/src/utils/settingsValidation/index.ts b/src/utils/settingsValidation/index.ts
index faf860b3..2269721f 100644
--- a/src/utils/settingsValidation/index.ts
+++ b/src/utils/settingsValidation/index.ts
@@ -1,4 +1,4 @@
-import { merge } from '../lang';
+import { merge, get } from '../lang';
 import { mode } from './mode';
 import { validateSplitFilters } from './splitFilters';
 import { STANDALONE_MODE, OPTIMIZED, LOCALHOST_MODE, DEBUG } from '../constants';
@@ -131,15 +131,8 @@ export function settingsValidation(config: unknown, validationParams: ISettingsV
   scheduler.eventsPushRate = fromSecondsToMillis(scheduler.eventsPushRate);
   scheduler.telemetryRefreshRate = fromSecondsToMillis(validateMinValue('telemetryRefreshRate', scheduler.telemetryRefreshRate, 60));
 
-  if (scheduler.impressionsRefreshRate !== base.scheduler.impressionsRefreshRate) {
-    // Validate impressionsRefreshRate defined by user
-    scheduler.impressionsRefreshRate = validateMinValue('impressionsRefreshRate', scheduler.impressionsRefreshRate,
-      withDefaults.sync.impressionsMode === DEBUG ? 1 : 60 // Min is 1 sec for DEBUG and 60 secs for OPTIMIZED
-    );
-  } else {
-    // Default impressionsRefreshRate for DEBUG mode is 60 secs
-    if (withDefaults.sync.impressionsMode === DEBUG) scheduler.impressionsRefreshRate = 60;
-  }
+  // Default impressionsRefreshRate for DEBUG mode is 60 secs
+  if (get(config, 'scheduler.impressionsRefreshRate') === undefined && withDefaults.sync.impressionsMode === DEBUG) scheduler.impressionsRefreshRate = 60;
   scheduler.impressionsRefreshRate = fromSecondsToMillis(scheduler.impressionsRefreshRate);
 
   // Log deprecation for old telemetry param