diff --git a/ghost/core/core/server/adapters/lib/redis/AdapterCacheRedis.js b/ghost/core/core/server/adapters/lib/redis/AdapterCacheRedis.js
index 9a1177aefef..92cf2e2b659 100644
--- a/ghost/core/core/server/adapters/lib/redis/AdapterCacheRedis.js
+++ b/ghost/core/core/server/adapters/lib/redis/AdapterCacheRedis.js
@@ -13,6 +13,7 @@ class AdapterCacheRedis extends BaseCacheAdapter {
      * @param {Object} [config.cache] - caching instance compatible with cache-manager's redis store
      * @param {String} [config.host] - redis host used in case no cache instance provided
      * @param {Number} [config.port] - redis port used in case no cache instance provided
+     * @param {String} [config.username] - redis username used in case no cache instance provided
      * @param {String} [config.password] - redis password used in case no cache instance provided
      * @param {Object} [config.clusterConfig] - redis cluster config used in case no cache instance provided
      * @param {Object} [config.storeConfig] - extra redis client config used in case no cache instance provided
@@ -46,7 +47,7 @@ class AdapterCacheRedis extends BaseCacheAdapter {
                 username: config.username,
                 password: config.password,
                 retryStrategy: () => {
-                    return (config.storeConfig.retryConnectSeconds || 10) * 1000;
+                    return (config.storeConfig?.retryConnectSeconds || 10) * 1000;
                 },
                 ...config.storeConfig,
                 clusterConfig: config.clusterConfig
diff --git a/ghost/core/test/unit/server/adapters/lib/redis/adapter-cache-redis.test.js b/ghost/core/test/unit/server/adapters/lib/redis/adapter-cache-redis.test.js
index 167f7117f4b..d6378a5d41f 100644
--- a/ghost/core/test/unit/server/adapters/lib/redis/adapter-cache-redis.test.js
+++ b/ghost/core/test/unit/server/adapters/lib/redis/adapter-cache-redis.test.js
@@ -41,6 +41,40 @@ describe('Adapter Cache Redis', function () {
         assert.equal(cache.redisClient.options.retryStrategy, false);
     });
 
+    describe('retryStrategy', function () {
+        it('does not throw and defaults to 10 seconds when storeConfig is not provided', function () {
+            const cache = new RedisCache({
+                reuseConnection: false
+            });
+            // retryStrategy is invoked by ioredis whenever Redis becomes unavailable.
+            // It must not crash even when storeConfig is omitted from the adapter config.
+            assert.doesNotThrow(() => cache.redisClient.options.retryStrategy(1));
+            assert.equal(cache.redisClient.options.retryStrategy(1), 10000);
+            cache.redisClient.disconnect();
+        });
+
+        it('defaults to 10 seconds when retryConnectSeconds is not set in storeConfig', function () {
+            const cache = new RedisCache({
+                storeConfig: {
+                    lazyConnect: true
+                },
+                reuseConnection: false
+            });
+            assert.equal(cache.redisClient.options.retryStrategy(1), 10000);
+        });
+
+        it('uses retryConnectSeconds from storeConfig when provided', function () {
+            const cache = new RedisCache({
+                storeConfig: {
+                    lazyConnect: true,
+                    retryConnectSeconds: 5
+                },
+                reuseConnection: false
+            });
+            assert.equal(cache.redisClient.options.retryStrategy(1), 5000);
+        });
+    });
+
     describe('get', function () {
         it('can get a value from the cache', async function () {
             const redisCacheInstanceStub = {