diff --git a/framework/commerce/types/cart.ts b/framework/commerce/types/cart.ts
index 4cd9d13da..e27374d98 100644
--- a/framework/commerce/types/cart.ts
+++ b/framework/commerce/types/cart.ts
@@ -107,7 +107,7 @@ export type GetCartHook<T extends CartTypes = CartTypes> = {
 
 export type AddItemHook<T extends CartTypes = CartTypes> = {
   data: T['cart']
-  input: T['itemBody']
+  input?: T['itemBody']
   fetcherInput: T['itemBody']
   body: { item: T['itemBody'] }
   actionInput: T['itemBody']
diff --git a/framework/commerce/utils/types.ts b/framework/commerce/utils/types.ts
index fe1507d08..751cea4a5 100644
--- a/framework/commerce/utils/types.ts
+++ b/framework/commerce/utils/types.ts
@@ -43,7 +43,10 @@ export type HookFetcherFn<H extends HookSchemaBase> = (
 export type HookFetcherContext<H extends HookSchemaBase> = {
   options: HookFetcherOptions
   input: H['fetcherInput']
-  fetch: <T = H['fetchData'], B = H['body']>(
+  fetch: <
+    T = H['fetchData'] extends {} | null ? H['fetchData'] : any,
+    B = H['body']
+  >(
     options: FetcherOptions<B>
   ) => Promise<T>
 }