diff --git a/packages/web/lib/networking/mutations/subscribeMutation.ts b/packages/web/lib/networking/mutations/subscribeMutation.ts
index 1351592a1..807a6049d 100644
--- a/packages/web/lib/networking/mutations/subscribeMutation.ts
+++ b/packages/web/lib/networking/mutations/subscribeMutation.ts
@@ -9,9 +9,16 @@ type SubscribeResult = {
   subscribe: Subscribe
 }
 
+enum SubscribeErrorCode {
+  BadRequest = 'BAD_REQUEST',
+  NotFound = 'NOT_FOUND',
+  Unauthorized = 'UNAUTHORIZED',
+  AlreadySubscribed = 'ALREADY_SUBSCRIBED',
+}
+
 type Subscribe = {
-  subscriptions: Subscription[]
-  errorCodes?: unknown[]
+  subscriptions?: Subscription[]
+  errorCodes?: SubscribeErrorCode[]
 }
 
 export type SubscribeMutationInput = {
@@ -22,7 +29,7 @@ export type SubscribeMutationInput = {
 
 export async function subscribeMutation(
   input: SubscribeMutationInput
-): Promise<any | undefined> {
+): Promise<SubscribeResult> {
   const mutation = gql`
     mutation Subscribe($input: SubscribeInput!) {
       subscribe(input: $input) {
@@ -39,9 +46,13 @@ export async function subscribeMutation(
   `
   try {
     const data = (await gqlFetcher(mutation, { input })) as SubscribeResult
-    return data.subscribe.errorCodes ? undefined : data.subscribe
+    return data
   } catch (error) {
     console.log('subscribeMutation error', error)
-    return undefined
+    return {
+      subscribe: {
+        errorCodes: [SubscribeErrorCode.BadRequest],
+      },
+    }
   }
 }
diff --git a/packages/web/lib/networking/mutations/updateSubscriptionMutation.ts b/packages/web/lib/networking/mutations/updateSubscriptionMutation.ts
index 24e7acd9f..b623ff482 100644
--- a/packages/web/lib/networking/mutations/updateSubscriptionMutation.ts
+++ b/packages/web/lib/networking/mutations/updateSubscriptionMutation.ts
@@ -7,9 +7,9 @@ interface UpdateSubscriptionResult {
 }
 
 export enum UpdateSubscriptionErrorCode {
-  BAD_REQUEST = 'BAD_REQUEST',
-  NOT_FOUND = 'NOT_FOUND',
-  UNAUTHORIZED = 'UNAUTHORIZED',
+  BadRequest = 'BAD_REQUEST',
+  NotFound = 'NOT_FOUND',
+  Unauthorized = 'UNAUTHORIZED',
 }
 
 interface UpdateSubscription {
@@ -52,7 +52,7 @@ export async function updateSubscriptionMutation(
     console.log('updateSubscriptionMutation error', error)
     return {
       updateSubscription: {
-        errorCodes: [UpdateSubscriptionErrorCode.BAD_REQUEST],
+        errorCodes: [UpdateSubscriptionErrorCode.BadRequest],
       },
     }
   }
diff --git a/packages/web/locales/en/messages.ts b/packages/web/locales/en/messages.ts
index 306e427c1..9b505ffe4 100644
--- a/packages/web/locales/en/messages.ts
+++ b/packages/web/locales/en/messages.ts
@@ -25,7 +25,9 @@ const errorMessages: Record<string, string> = {
     "Your sign up page has timed out, you'll be redirected to Google sign in page to authenticate again.",
   'error.USER_EXISTS': 'User with this email exists already',
   'error.UNKNOWN': 'An unknown error occurred',
-  'error.INVALID_PASSWORD': 'Invalid password. Password must be at least 8 chars.'
+  'error.INVALID_PASSWORD': 'Invalid password. Password must be at least 8 chars.',
+  'error.ALREADY_SUBSCRIBED': 'You are already subscribed to this feed',
+  'error.BAD_REQUEST': 'Bad request',
 }
 
 const loginPageMessages: Record<string, string> = {
diff --git a/packages/web/pages/settings/rss/add.tsx b/packages/web/pages/settings/rss/add.tsx
index da7196792..51bcdd0e7 100644
--- a/packages/web/pages/settings/rss/add.tsx
+++ b/packages/web/pages/settings/rss/add.tsx
@@ -14,6 +14,7 @@ import { SettingsLayout } from '../../../components/templates/SettingsLayout'
 import { subscribeMutation } from '../../../lib/networking/mutations/subscribeMutation'
 import { SubscriptionType } from '../../../lib/networking/queries/useGetSubscriptionsQuery'
 import { showSuccessToast } from '../../../lib/toastHelpers'
+import { formatMessage } from '../../../locales/en/messages'
 
 // Styles
 const Header = styled(Box, {
@@ -30,20 +31,21 @@ export default function AddRssFeed(): JSX.Element {
   const [feedUrl, setFeedUrl] = useState<string>('')
 
   const subscribe = useCallback(async () => {
-    try {
-      const result = await subscribeMutation({
-        url: feedUrl,
-        subscriptionType: SubscriptionType.RSS,
+    const result = await subscribeMutation({
+      url: feedUrl,
+      subscriptionType: SubscriptionType.RSS,
+    })
+
+    if (result.subscribe.errorCodes) {
+      const errorMessage = formatMessage({
+        id: `error.${result.subscribe.errorCodes[0]}`,
       })
-      if (result) {
-        router.push(`/settings/rss`)
-        showSuccessToast('New RSS feed has been added.')
-      } else {
-        setErrorMessage('There was an error adding new RSS feed.')
-      }
-    } catch (err) {
-      setErrorMessage('Error: ' + err)
+      setErrorMessage(`There was an error adding new RSS feed: ${errorMessage}`)
+      return
     }
+
+    router.push(`/settings/rss`)
+    showSuccessToast('New RSS feed has been added.')
   }, [feedUrl, router])
 
   return (