diff --git a/lib/event_processor/event_processor_factory.spec.ts b/lib/event_processor/event_processor_factory.spec.ts
index 31b1b62ed..9aaa97f55 100644
--- a/lib/event_processor/event_processor_factory.spec.ts
+++ b/lib/event_processor/event_processor_factory.spec.ts
@@ -79,14 +79,14 @@ describe('getBatchEventProcessor', () => {
       defaultFlushInterval: 10000,
       defaultBatchSize: 10,
       eventStore: 'abc' as any,
-    })).toThrow('Invalid event store');
+    })).toThrow('Invalid store');
 
     expect(() => getBatchEventProcessor({
       eventDispatcher: getMockEventDispatcher(),
       defaultFlushInterval: 10000,
       defaultBatchSize: 10,
       eventStore: 123 as any,
-    })).toThrow('Invalid event store');
+    })).toThrow('Invalid store');
 
     expect(() => getBatchEventProcessor({
       eventDispatcher: getMockEventDispatcher(),
diff --git a/lib/event_processor/event_processor_factory.ts b/lib/event_processor/event_processor_factory.ts
index dd50c72f2..393ce436a 100644
--- a/lib/event_processor/event_processor_factory.ts
+++ b/lib/event_processor/event_processor_factory.ts
@@ -23,15 +23,13 @@ import { ForwardingEventProcessor } from "./forwarding_event_processor";
 import { BatchEventProcessor, DEFAULT_MAX_BACKOFF, DEFAULT_MIN_BACKOFF, EventWithId, RetryConfig } from "./batch_event_processor";
 import { AsyncPrefixStore, Store, SyncPrefixStore } from "../utils/cache/store";
 import { Maybe } from "../utils/type";
+import { validateStore } from "../utils/cache/store_validator";
 
 export const INVALID_EVENT_DISPATCHER = 'Invalid event dispatcher';
 
 export const FAILED_EVENT_RETRY_INTERVAL = 20 * 1000; 
 export const EVENT_STORE_PREFIX = 'optly_event:';
 
-export const INVALID_STORE = 'Invalid event store';
-export const INVALID_STORE_METHOD = 'Invalid store method %s';
-
 export const getPrefixEventStore = (store: Store<string>): Store<EventWithId> => {
   if (store.operation === 'async') {
     return new AsyncPrefixStore<string, EventWithId>(
@@ -84,23 +82,6 @@ export const validateEventDispatcher = (eventDispatcher: EventDispatcher): void
   }
 }
 
-const validateStore = (store: any) => {
-  const errors = [];
-  if (!store || typeof store !== 'object') {
-    throw new Error(INVALID_STORE);
-  }
-
-  for (const method of ['set', 'get', 'remove', 'getKeys']) {
-    if (typeof store[method] !== 'function') {
-      errors.push(INVALID_STORE_METHOD.replace('%s', method));
-    }
-  }
-
-  if (errors.length > 0) {
-    throw new Error(errors.join(', '));
-  }
-}
-
 export const getBatchEventProcessor = (
     options: BatchEventProcessorFactoryOptions,
     EventProcessorConstructor: typeof BatchEventProcessor = BatchEventProcessor
diff --git a/lib/project_config/config_manager_factory.spec.ts b/lib/project_config/config_manager_factory.spec.ts
index 1ad4dc689..7def4f9a8 100644
--- a/lib/project_config/config_manager_factory.spec.ts
+++ b/lib/project_config/config_manager_factory.spec.ts
@@ -1,5 +1,5 @@
 /**
- * Copyright 2024, Optimizely
+ * Copyright 2024-2025, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,6 +53,52 @@ describe('getPollingConfigManager', () => {
     MockExponentialBackoff.mockClear();
   });
 
+  it('should throw an error if the passed cache is not valid', () => {
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: 1 as any,
+    })).toThrow('Invalid store');
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: 'abc' as any,
+    })).toThrow('Invalid store');
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: {} as any,
+    })).toThrow('Invalid store method set, Invalid store method get, Invalid store method remove, Invalid store method getKeys');
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: { set: 'abc', get: 'abc', remove: 'abc', getKeys: 'abc' } as any,
+    })).toThrow('Invalid store method set, Invalid store method get, Invalid store method remove, Invalid store method getKeys');
+
+    const noop = () => {};
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: { set: noop, get: 'abc', remove: 'abc', getKeys: 'abc' } as any,
+    })).toThrow('Invalid store method get, Invalid store method remove, Invalid store method getKeys');
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: { set: noop, get: noop, remove: 'abc', getKeys: 'abc' } as any,
+    })).toThrow('Invalid store method remove, Invalid store method getKeys');
+
+    expect(() => getPollingConfigManager({
+      sdkKey: 'sdkKey',
+      requestHandler: { makeRequest: vi.fn() },
+      cache: { set: noop, get: noop, remove: noop, getKeys: 'abc' } as any,
+    })).toThrow('Invalid store method getKeys');
+  });
+
   it('uses a repeater with exponential backoff for the datafileManager', () => {
     const config = {
       sdkKey: 'sdkKey',
diff --git a/lib/project_config/config_manager_factory.ts b/lib/project_config/config_manager_factory.ts
index 89c60593c..e7d21aeea 100644
--- a/lib/project_config/config_manager_factory.ts
+++ b/lib/project_config/config_manager_factory.ts
@@ -25,6 +25,7 @@ import { StartupLog } from "../service";
 import { MIN_UPDATE_INTERVAL, UPDATE_INTERVAL_BELOW_MINIMUM_MESSAGE } from './constant';
 import { LogLevel } from '../logging/logger'
 import { Store } from "../utils/cache/store";
+import { validateStore } from "../utils/cache/store_validator";
 
 export const INVALID_CONFIG_MANAGER = "Invalid config manager";
 
@@ -63,6 +64,10 @@ export type PollingConfigManagerFactoryOptions = PollingConfigManagerConfig & {
 export const getPollingConfigManager = (
   opt: PollingConfigManagerFactoryOptions
 ): ProjectConfigManager => {
+  if (opt.cache) {
+    validateStore(opt.cache);
+  }
+  
   const updateInterval = opt.updateInterval ?? DEFAULT_UPDATE_INTERVAL;
 
   const backoff = new ExponentialBackoff(1000, updateInterval, 500);
diff --git a/lib/utils/cache/store_validator.ts b/lib/utils/cache/store_validator.ts
new file mode 100644
index 000000000..949bb25c3
--- /dev/null
+++ b/lib/utils/cache/store_validator.ts
@@ -0,0 +1,36 @@
+
+/**
+ * Copyright 2025, Optimizely
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export const INVALID_STORE = 'Invalid store';
+export const INVALID_STORE_METHOD = 'Invalid store method %s';
+
+// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
+export const validateStore = (store: any): void => {
+  const errors = [];
+  if (!store || typeof store !== 'object') {
+    throw new Error(INVALID_STORE);
+  }
+
+  for (const method of ['set', 'get', 'remove', 'getKeys']) {
+    if (typeof store[method] !== 'function') {
+      errors.push(INVALID_STORE_METHOD.replace('%s', method));
+    }
+  }
+
+  if (errors.length > 0) {
+    throw new Error(errors.join(', '));
+  }
+}
diff --git a/vitest.config.mts b/vitest.config.mts
index 584eeb60d..1bce36eb0 100644
--- a/vitest.config.mts
+++ b/vitest.config.mts
@@ -1,5 +1,5 @@
 /**
- * Copyright 2024 Optimizely
+ * Copyright 2024-2025, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.