diff --git a/apps/web/components/webhook/WebhookDialogForm.tsx b/apps/web/components/webhook/WebhookDialogForm.tsx
index 6773e9b649..e1988a5c0a 100644
--- a/apps/web/components/webhook/WebhookDialogForm.tsx
+++ b/apps/web/components/webhook/WebhookDialogForm.tsx
@@ -1,3 +1,4 @@
+import { Webhook } from "@prisma/client";
 import { useEffect, useState } from "react";
 import { Controller, useForm } from "react-hook-form";
 
@@ -20,10 +21,12 @@ export default function WebhookDialogForm(props: {
   defaultValues?: TWebhook;
   app?: string;
   handleClose: () => void;
+  webhooks: Webhook[];
 }) {
   const { t } = useLocale();
   const utils = trpc.useContext();
   const appId = props.app;
+  const webhooks = props.webhooks;
 
   const triggers = !appId
     ? WEBHOOK_TRIGGER_EVENTS_GROUPED_BY_APP["core"]
@@ -45,6 +48,10 @@ export default function WebhookDialogForm(props: {
   const hasSecretKey = !!defaultValues.secret;
   const currentSecret = defaultValues.secret;
 
+  const subscriberUrlReserved = (subscriberUrl: string, id: string): boolean => {
+    return !!webhooks.find((webhook) => webhook.subscriberUrl === subscriberUrl && webhook.id !== id);
+  };
+
   const form = useForm({
     defaultValues,
   });
@@ -64,6 +71,10 @@ export default function WebhookDialogForm(props: {
       data-testid="WebhookDialogForm"
       form={form}
       handleSubmit={async (event) => {
+        if (subscriberUrlReserved(event.subscriberUrl, event.id)) {
+          showToast(t("webhook_subscriber_url_reserved"), "error");
+          return;
+        }
         const e = changeSecret
           ? { ...event, eventTypeId: props.eventTypeId, appId }
           : { ...event, secret: currentSecret, eventTypeId: props.eventTypeId, appId };
diff --git a/apps/web/components/webhook/WebhookListContainer.tsx b/apps/web/components/webhook/WebhookListContainer.tsx
index 255f122513..74f99e8b35 100644
--- a/apps/web/components/webhook/WebhookListContainer.tsx
+++ b/apps/web/components/webhook/WebhookListContainer.tsx
@@ -74,6 +74,7 @@ export default function WebhookListContainer(props: WebhookListContainerType) {
             <DialogContent>
               <WebhookDialogForm
                 app={props.appId}
+                webhooks={data}
                 eventTypeId={props.eventTypeId}
                 handleClose={() => setNewWebhookModal(false)}
               />
@@ -86,6 +87,7 @@ export default function WebhookListContainer(props: WebhookListContainerType) {
                 <WebhookDialogForm
                   app={props.appId}
                   key={editing.id}
+                  webhooks={data}
                   eventTypeId={props.eventTypeId || undefined}
                   handleClose={() => setEditModalOpen(false)}
                   defaultValues={editing}
diff --git a/apps/web/public/static/locales/en/common.json b/apps/web/public/static/locales/en/common.json
index 8aa60ce502..9348881c68 100644
--- a/apps/web/public/static/locales/en/common.json
+++ b/apps/web/public/static/locales/en/common.json
@@ -1040,6 +1040,7 @@
   "company_size": "Company size",
   "what_help_needed": "What do you need help with?",
   "variable_format": "Variable format",
+  "webhook_subscriber_url_reserved": "Webhook subscriber url is already defined",
   "custom_input_as_variable_info": "Ignore all special characters of the additional input label (use only letters and numbers), use uppercase for all letters and replace whitespaces with underscores.",
   "using_additional_inputs_as_variables": "How to use additional inputs as variables?",
   "download_desktop_app": "Download desktop app",
diff --git a/packages/prisma/migrations/20220811132430_add_unique_index_to_webhook/migration.sql b/packages/prisma/migrations/20220811132430_add_unique_index_to_webhook/migration.sql
new file mode 100644
index 0000000000..08bf48cc20
--- /dev/null
+++ b/packages/prisma/migrations/20220811132430_add_unique_index_to_webhook/migration.sql
@@ -0,0 +1,8 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[userId,subscriberUrl]` on the table `Webhook` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- CreateIndex
+CREATE UNIQUE INDEX "Webhook_userId_subscriberUrl_key" ON "Webhook"("userId", "subscriberUrl");
diff --git a/packages/prisma/schema.prisma b/packages/prisma/schema.prisma
index 97e5f7e888..b4f6840fc5 100644
--- a/packages/prisma/schema.prisma
+++ b/packages/prisma/schema.prisma
@@ -407,6 +407,8 @@ model Webhook {
   app             App?                   @relation(fields: [appId], references: [slug], onDelete: Cascade)
   appId           String?
   secret          String?
+
+  @@unique([userId, subscriberUrl], name: "courseIdentifier")
 }
 
 model Impersonations {