diff --git a/app/scenes/UserDelete.js b/app/scenes/UserDelete.js
index c03e004c..89ba2265 100644
--- a/app/scenes/UserDelete.js
+++ b/app/scenes/UserDelete.js
@@ -28,7 +28,6 @@ class UserDelete extends React.Component<Props> {
       this.props.auth.logout();
     } catch (error) {
       this.props.ui.showToast(error.message);
-      throw error;
     } finally {
       this.isDeleting = false;
     }
diff --git a/app/utils/ApiClient.js b/app/utils/ApiClient.js
index 0967d3fd..dbc62949 100644
--- a/app/utils/ApiClient.js
+++ b/app/utils/ApiClient.js
@@ -5,10 +5,12 @@ import stores from "stores";
 import download from "./download";
 import {
   AuthorizationError,
+  BadRequestError,
   NetworkError,
   NotFoundError,
   OfflineError,
   RequestError,
+  ServiceUnavailableError,
   UpdateRequiredError,
 } from "./errors";
 
@@ -141,6 +143,10 @@ class ApiClient {
       throw new UpdateRequiredError(error.message);
     }
 
+    if (response.status === 400) {
+      throw new BadRequestError(error.message);
+    }
+
     if (response.status === 403) {
       throw new AuthorizationError(error.message);
     }
@@ -149,6 +155,10 @@ class ApiClient {
       throw new NotFoundError(error.message);
     }
 
+    if (response.status === 503) {
+      throw new ServiceUnavailableError(error.message);
+    }
+
     throw new RequestError(error.message);
   };
 
diff --git a/app/utils/errors.js b/app/utils/errors.js
index 662a57c7..db71a7c3 100644
--- a/app/utils/errors.js
+++ b/app/utils/errors.js
@@ -2,8 +2,10 @@
 import ExtendableError from "es6-error";
 
 export class AuthorizationError extends ExtendableError {}
+export class BadRequestError extends ExtendableError {}
 export class NetworkError extends ExtendableError {}
 export class NotFoundError extends ExtendableError {}
 export class OfflineError extends ExtendableError {}
+export class ServiceUnavailableError extends ExtendableError {}
 export class RequestError extends ExtendableError {}
 export class UpdateRequiredError extends ExtendableError {}
diff --git a/server/static/index.html b/server/static/index.html
index 2f79916f..db53cc12 100644
--- a/server/static/index.html
+++ b/server/static/index.html
@@ -54,9 +54,11 @@
           ignoreErrors: [
             "ResizeObserver loop limit exceeded",
             "AuthorizationError",
+            "BadRequestError",
             "NetworkError",
             "NotFoundError",
             "OfflineError",
+            "ServiceUnavailableError",
             "UpdateRequiredError",
             "ChunkLoadError",
           ],