diff --git a/src/resource_clients/schedule_collection.ts b/src/resource_clients/schedule_collection.ts
index 43b7066d..fa0d43fa 100644
--- a/src/resource_clients/schedule_collection.ts
+++ b/src/resource_clients/schedule_collection.ts
@@ -80,7 +80,7 @@ export class ScheduleCollectionClient extends ResourceCollectionClient {
      * @returns The created schedule object.
      * @see https://docs.apify.com/api/v2/schedules-post
      */
-    async create(schedule: ScheduleCreateOrUpdateData): Promise<Schedule> {
+    async create(schedule?: ScheduleCreateOrUpdateData): Promise<Schedule> {
         ow(schedule, ow.optional.object);
 
         return this._create(schedule);
diff --git a/src/resource_clients/webhook_collection.ts b/src/resource_clients/webhook_collection.ts
index ce39dbcd..f5699d8d 100644
--- a/src/resource_clients/webhook_collection.ts
+++ b/src/resource_clients/webhook_collection.ts
@@ -82,7 +82,7 @@ export class WebhookCollectionClient extends ResourceCollectionClient {
      * @returns The created webhook object.
      * @see https://docs.apify.com/api/v2/webhooks-post
      */
-    async create(webhook: WebhookUpdateData): Promise<Webhook> {
+    async create(webhook?: WebhookUpdateData): Promise<Webhook> {
         ow(webhook, ow.optional.object);
 
         return this._create(webhook);