diff --git a/mailpoet/assets/js/src/automation/api/index.ts b/mailpoet/assets/js/src/automation/api/index.ts
index 37e5b8f5aa..be5cd4dd05 100644
--- a/mailpoet/assets/js/src/automation/api/index.ts
+++ b/mailpoet/assets/js/src/automation/api/index.ts
@@ -5,6 +5,16 @@ export * from './hooks';
 
 const apiUrl = `${api.root}/mailpoet/v1/automation/`;
 
+export type ApiError = {
+  code?: string;
+  message?: string;
+  data?: {
+    status?: number;
+    details?: Error;
+    params?: Record<string, string>;
+  };
+};
+
 export const initializeApi = () => {
   apiFetch.use(apiFetch.createRootURLMiddleware(apiUrl));
   apiFetch.use(apiFetch.createNonceMiddleware(api.nonce));
diff --git a/mailpoet/assets/js/src/automation/editor/api-error-handler.tsx b/mailpoet/assets/js/src/automation/editor/api-error-handler.tsx
new file mode 100644
index 0000000000..eeba8a3246
--- /dev/null
+++ b/mailpoet/assets/js/src/automation/editor/api-error-handler.tsx
@@ -0,0 +1,36 @@
+import apiFetch, { APIFetchOptions } from '@wordpress/api-fetch';
+import { dispatch, StoreDescriptor } from '@wordpress/data';
+import { __ } from '@wordpress/i18n';
+import { store as noticesStore } from '@wordpress/notices';
+import { ApiError } from '../api';
+
+export const registerApiErrorHandler = (): void =>
+  apiFetch.use(
+    async (
+      options: APIFetchOptions,
+      next: (nextOptions: APIFetchOptions) => Promise<unknown>,
+    ) => {
+      try {
+        const result = await next(options);
+        return result;
+      } catch (error) {
+        const errorObject = error as ApiError;
+        const status = errorObject.data?.status;
+
+        if (status && status >= 400 && status < 500) {
+          const message = errorObject.message;
+          void dispatch(noticesStore as StoreDescriptor).createErrorNotice(
+            message ?? __('An unknown error occurred.', 'mailpoet'),
+            { explicitDismiss: true },
+          );
+          return undefined;
+        }
+
+        void dispatch(noticesStore as StoreDescriptor).createErrorNotice(
+          __('An unknown error occurred.', 'mailpoet'),
+          { explicitDismiss: true },
+        );
+        throw error;
+      }
+    },
+  );
diff --git a/mailpoet/assets/js/src/automation/editor/components/workflow/index.tsx b/mailpoet/assets/js/src/automation/editor/components/workflow/index.tsx
index 0f66a40544..1099fa680c 100644
--- a/mailpoet/assets/js/src/automation/editor/components/workflow/index.tsx
+++ b/mailpoet/assets/js/src/automation/editor/components/workflow/index.tsx
@@ -12,7 +12,6 @@ import { Separator } from './separator';
 import { Step } from './step';
 import { Step as StepData } from './types';
 import { InserterPopover } from '../inserter-popover';
-import { EditorNotices } from '../notices';
 import { storeName } from '../../store';
 import { AddTrigger } from './add-trigger';
 
@@ -95,7 +94,6 @@ export function Workflow(): JSX.Element {
 
   return (
     <WorkflowCompositeContext.Provider value={compositeState}>
-      <EditorNotices />
       <Composite
         state={compositeState}
         role="tree"
diff --git a/mailpoet/assets/js/src/automation/editor/index.tsx b/mailpoet/assets/js/src/automation/editor/index.tsx
index 58ab6ab7ab..96fd142a8e 100644
--- a/mailpoet/assets/js/src/automation/editor/index.tsx
+++ b/mailpoet/assets/js/src/automation/editor/index.tsx
@@ -13,6 +13,7 @@ import { addQueryArgs } from '@wordpress/url';
 import { Header } from './components/header';
 import { InserterSidebar } from './components/inserter-sidebar';
 import { KeyboardShortcuts } from './components/keyboard-shortcuts';
+import { EditorNotices } from './components/notices';
 import { Sidebar } from './components/sidebar';
 import { Workflow } from './components/workflow';
 import { createStore, storeName } from './store';
@@ -21,6 +22,7 @@ import { initialize as initializeCoreIntegration } from '../integrations/core';
 import { initialize as initializeMailPoetIntegration } from '../integrations/mailpoet';
 import { MailPoet } from '../../mailpoet';
 import { LISTING_NOTICE_PARAMETERS } from '../listing/workflow-listing-notices';
+import { registerApiErrorHandler } from './api-error-handler';
 
 // See:
 //   https://github.com/WordPress/gutenberg/blob/9601a33e30ba41bac98579c8d822af63dd961488/packages/edit-post/src/components/layout/index.js
@@ -79,7 +81,12 @@ function Editor(): JSX.Element {
             )
           }
           header={<Header showInserterToggle={showInserterSidebar} />}
-          content={<Workflow />}
+          content={
+            <>
+              <EditorNotices />
+              <Workflow />
+            </>
+          }
           sidebar={<ComplementaryArea.Slot scope={storeName} />}
           secondarySidebar={
             showInserterSidebar && isInserterOpened ? <InserterSidebar /> : null
@@ -96,6 +103,7 @@ window.addEventListener('DOMContentLoaded', () => {
 
   const root = document.getElementById('mailpoet_automation_editor');
   if (root) {
+    registerApiErrorHandler();
     initializeApi();
     initializeCoreIntegration();
     initializeMailPoetIntegration();
diff --git a/mailpoet/assets/js/src/automation/editor/store/actions.ts b/mailpoet/assets/js/src/automation/editor/store/actions.ts
index 823690619b..4c8f366e4c 100644
--- a/mailpoet/assets/js/src/automation/editor/store/actions.ts
+++ b/mailpoet/assets/js/src/automation/editor/store/actions.ts
@@ -54,12 +54,12 @@ export function* save() {
   const data = yield apiFetch({
     path: `/workflows/${workflow.id}`,
     method: 'PUT',
-    data: workflow,
+    data: { ...workflow },
   });
 
   return {
     type: 'SAVE',
-    workflow: data.data,
+    workflow: data?.data ?? workflow,
   } as const;
 }
 
@@ -76,7 +76,7 @@ export function* activate() {
 
   return {
     type: 'ACTIVATE',
-    workflow: data.data,
+    workflow: data?.data ?? workflow,
   } as const;
 }