diff --git a/assets/js/errors.js b/assets/js/errors.js
index 7219e184af..d7bfaa7d6b 100644
--- a/assets/js/errors.js
+++ b/assets/js/errors.js
@@ -11,3 +11,10 @@ export class TimeoutError extends Error {
         this.name = 'TimeoutError';
     }
 }
+
+export class HttpError extends Error {
+    constructor(message) {
+        super(message);
+        this.name = 'HttpError';
+    }
+}
diff --git a/assets/js/helpers/ajax.js b/assets/js/helpers/ajax.js
index bf69327b42..e4d64e7a8a 100644
--- a/assets/js/helpers/ajax.js
+++ b/assets/js/helpers/ajax.js
@@ -1,7 +1,7 @@
 import formurlencoded from 'form-urlencoded';
 import mergeDeepLeft from 'ramda/src/mergeDeepLeft.js';
 import pipe from 'ramda/src/pipe.js';
-import { TimeoutError } from '../errors';
+import { HttpError, TimeoutError } from '../errors';
 
 /**
  * Passing this function as a Promise handler will make the promise fail when the predicate is not true.
@@ -10,7 +10,7 @@ export const rejectUnless = (pred) => (response) => {
     if (pred(response)) {
         return response;
     } else {
-        let err = new Error(response.statusText);
+        let err = new HttpError(response.statusText);
         err.response = response;
         throw err;
     }
diff --git a/assets/js/selfoss-base.js b/assets/js/selfoss-base.js
index c20c6cf834..2e422b942d 100644
--- a/assets/js/selfoss-base.js
+++ b/assets/js/selfoss-base.js
@@ -5,6 +5,7 @@ import { getInstanceInfo, login, logout } from './requests/common';
 import * as itemsRequests from './requests/items';
 import { getAllTags } from './requests/tags';
 import * as ajax from './helpers/ajax';
+import { HttpError, TimeoutError } from './errors';
 
 /**
  * base javascript application
@@ -566,14 +567,14 @@ var selfoss = {
             selfoss.db.setOnline();
             displayNextUnread();
         }).catch(function(error) {
-            selfoss.handleAjaxError(error?.response?.status || 0).then(function() {
+            selfoss.handleAjaxError(error).then(function() {
                 let statuses = ids.map(id => ({
                     entryId: id,
                     name: 'unread',
                     value: false
                 }));
                 selfoss.dbOffline.enqueueStatuses(statuses);
-            }).catch(function() {
+            }).catch(function(error) {
                 content.html(articleList);
                 selfoss.ui.refreshStreamButtons(true, hadMore);
                 selfoss.ui.listReady();
@@ -583,7 +584,13 @@ var selfoss = {
     },
 
 
-    handleAjaxError: function(httpCode, tryOffline = true) {
+    handleAjaxError: function(error, tryOffline = true) {
+        if (!(error instanceof HttpError || error instanceof TimeoutError)) {
+            throw error;
+        }
+
+        const httpCode = error?.response?.status || 0;
+
         if (tryOffline && httpCode != 403) {
             return selfoss.db.setOffline();
         } else {
@@ -591,7 +598,7 @@ var selfoss = {
                 selfoss.ui.logout();
                 selfoss.ui.showLogin(selfoss.ui._('error_session_expired'));
             }
-            return Promise.reject();
+            throw error;
         }
     },
 
diff --git a/assets/js/selfoss-db.js b/assets/js/selfoss-db.js
index 3de1ec63fa..598a606a1e 100644
--- a/assets/js/selfoss-db.js
+++ b/assets/js/selfoss-db.js
@@ -228,7 +228,7 @@ selfoss.dbOnline = {
             }
         }).catch(function(error) {
             selfoss.dbOnline._syncDone(false);
-            selfoss.handleAjaxError(error?.response?.status || 0).catch(function() {
+            selfoss.handleAjaxError(error).catch(function(error) {
                 selfoss.ui.showError(selfoss.ui._('error_sync') + ' ' + error.message);
             });
         }).finally(function() {
@@ -282,10 +282,10 @@ selfoss.dbOnline = {
                 return;
             }
 
-            selfoss.handleAjaxError(error?.response?.status || 0).then(function() {
+            selfoss.handleAjaxError(error).then(function() {
                 selfoss.dbOffline.reloadList();
                 selfoss.ui.afterReloadList();
-            }).catch(() => {
+            }).catch(function(error) {
                 selfoss.ui.showError(selfoss.ui._('error_loading') + ' ' + error.message);
                 selfoss.events.entries();
                 selfoss.ui.refreshStreamButtons();
diff --git a/assets/js/selfoss-events-entriestoolbar.js b/assets/js/selfoss-events-entriestoolbar.js
index 5980386a57..1ab4b6ac22 100644
--- a/assets/js/selfoss-events-entriestoolbar.js
+++ b/assets/js/selfoss-events-entriestoolbar.js
@@ -103,10 +103,10 @@ selfoss.events.entriesToolbar = function(parent) {
 
             itemsRequests.starr(id, starr).then(() => {
                 selfoss.db.setOnline();
-            }).catch((error) => {
-                selfoss.handleAjaxError(error?.response?.status || 0).then(function() {
+            }).catch(function(error) {
+                selfoss.handleAjaxError(error).then(function() {
                     selfoss.dbOffline.enqueueStatus(id, 'starred', starr);
-                }).catch(function() {
+                }).catch(function(error) {
                     // rollback ui changes
                     selfoss.ui.entryStar(id, !starr);
                     updateStats(!starr);
@@ -151,10 +151,10 @@ selfoss.events.entriesToolbar = function(parent) {
 
             itemsRequests.mark(id, !unread).then(() => {
                 selfoss.db.setOnline();
-            }).catch((error) => {
-                selfoss.handleAjaxError(error?.response?.status || 0).then(function() {
+            }).catch(function(error) {
+                selfoss.handleAjaxError(error).then(function() {
                     selfoss.dbOffline.enqueueStatus(id, 'unread', !unread);
-                }).catch(function() {
+                }).catch(function(error) {
                     // rollback ui changes
                     selfoss.ui.entryMark(id, unread);
                     updateStats(!unread);
diff --git a/assets/js/selfoss-events.js b/assets/js/selfoss-events.js
index 54fb677712..840cad5405 100644
--- a/assets/js/selfoss-events.js
+++ b/assets/js/selfoss-events.js
@@ -213,7 +213,7 @@ selfoss.events = {
                     return;
                 }
 
-                selfoss.handleAjaxError(error?.response?.status || 0, false).catch(function() {
+                selfoss.handleAjaxError(error, false).catch(function(error) {
                     selfoss.ui.showError(selfoss.ui._('error_loading') + ' ' + error.message);
                 });
             }).finally(() => {