diff --git a/.changeset/puny-rules-hide.md b/.changeset/puny-rules-hide.md
new file mode 100644
index 0000000000..d971ed0a54
--- /dev/null
+++ b/.changeset/puny-rules-hide.md
@@ -0,0 +1,5 @@
+---
+'@posthog/react': patch
+---
+
+Updated feature flag hooks to properly check if client is initialized and prevent client is undefined errors
diff --git a/packages/react/src/hooks/useActiveFeatureFlags.ts b/packages/react/src/hooks/useActiveFeatureFlags.ts
index 8a26813a1c..319fb05c0a 100644
--- a/packages/react/src/hooks/useActiveFeatureFlags.ts
+++ b/packages/react/src/hooks/useActiveFeatureFlags.ts
@@ -13,7 +13,7 @@ export function useActiveFeatureFlags(): string[] {
     }, [client])
 
     // if the client is not loaded yet and we have a bootstrapped value, use it
-    if (!client.featureFlags.hasLoadedFlags && bootstrap?.featureFlags) {
+    if (!client?.featureFlags?.hasLoadedFlags && bootstrap?.featureFlags) {
         return Object.keys(bootstrap.featureFlags)
     }
 
diff --git a/packages/react/src/hooks/useFeatureFlagEnabled.ts b/packages/react/src/hooks/useFeatureFlagEnabled.ts
index 2e3e3ee797..bd58db1f24 100644
--- a/packages/react/src/hooks/useFeatureFlagEnabled.ts
+++ b/packages/react/src/hooks/useFeatureFlagEnabled.ts
@@ -16,7 +16,7 @@ export function useFeatureFlagEnabled(flag: string): boolean | undefined {
     const bootstrapped = bootstrap?.featureFlags?.[flag]
 
     // if the client is not loaded yet, check if we have a bootstrapped value and then true/false it
-    if (!client.featureFlags.hasLoadedFlags && bootstrap?.featureFlags) {
+    if (!client?.featureFlags?.hasLoadedFlags && bootstrap?.featureFlags) {
         return isUndefined(bootstrapped) ? undefined : !!bootstrapped
     }
 
diff --git a/packages/react/src/hooks/useFeatureFlagPayload.ts b/packages/react/src/hooks/useFeatureFlagPayload.ts
index b2ed3eae6a..4d2a59f8ff 100644
--- a/packages/react/src/hooks/useFeatureFlagPayload.ts
+++ b/packages/react/src/hooks/useFeatureFlagPayload.ts
@@ -14,7 +14,7 @@ export function useFeatureFlagPayload(flag: string): JsonType {
     }, [client, flag])
 
     // if the client is not loaded yet, use the bootstrapped value
-    if (!client.featureFlags.hasLoadedFlags && bootstrap?.featureFlagPayloads) {
+    if (!client?.featureFlags?.hasLoadedFlags && bootstrap?.featureFlagPayloads) {
         return bootstrap.featureFlagPayloads[flag]
     }
 
diff --git a/packages/react/src/hooks/useFeatureFlagVariantKey.ts b/packages/react/src/hooks/useFeatureFlagVariantKey.ts
index 084ff8f947..48e36eb2b9 100644
--- a/packages/react/src/hooks/useFeatureFlagVariantKey.ts
+++ b/packages/react/src/hooks/useFeatureFlagVariantKey.ts
@@ -14,7 +14,7 @@ export function useFeatureFlagVariantKey(flag: string): string | boolean | undef
         })
     }, [client, flag])
 
-    if (!client.featureFlags.hasLoadedFlags && bootstrap?.featureFlags) {
+    if (!client?.featureFlags?.hasLoadedFlags && bootstrap?.featureFlags) {
         return bootstrap.featureFlags[flag]
     }