diff --git a/packages/checkout/widgets-lib/src/widgets/checkout/context/CheckoutContextProvider.tsx b/packages/checkout/widgets-lib/src/widgets/checkout/context/CheckoutContextProvider.tsx
index ebd834174d..f72b746f1d 100644
--- a/packages/checkout/widgets-lib/src/widgets/checkout/context/CheckoutContextProvider.tsx
+++ b/packages/checkout/widgets-lib/src/widgets/checkout/context/CheckoutContextProvider.tsx
@@ -38,13 +38,17 @@ export function CheckoutContextProvider({ values, children }: CheckoutContextPro
   }, [checkoutAppIframe, checkout]);
 
   useEffect(() => {
-    if (!provider || !postMessageHandler) return;
+    if (!provider || !postMessageHandler) return undefined;
     checkoutDispatch({
       payload: {
         type: CheckoutActions.SET_PROVIDER_RELAY,
         providerRelay: new ProviderRelay(postMessageHandler, provider),
       },
     });
+
+    return () => {
+      postMessageHandler?.destroy();
+    };
   }, [provider, postMessageHandler]);
 
   return (