diff --git a/apps/nextjs/src/app/[locale]/auth/login/_login-form.tsx b/apps/nextjs/src/app/[locale]/auth/login/_login-form.tsx
index 8d36d1e79..47b8a7f7f 100644
--- a/apps/nextjs/src/app/[locale]/auth/login/_login-form.tsx
+++ b/apps/nextjs/src/app/[locale]/auth/login/_login-form.tsx
@@ -4,7 +4,7 @@ import type { PropsWithChildren } from "react";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { useRouter, useSearchParams } from "next/navigation";
 import { Anchor, Button, Card, Code, Collapse, Divider, PasswordInput, Stack, Text, TextInput } from "@mantine/core";
-import { useDisclosure } from "@mantine/hooks";
+import { useDisclosure, useMounted } from "@mantine/hooks";
 import { z } from "zod/v4";
 
 import { signIn } from "@homarr/auth/client";
@@ -32,6 +32,7 @@ export const LoginForm = ({ providers, oidcClientName, isOidcAutoLoginEnabled, c
   const searchParams = useSearchParams();
   const isError = searchParams.has("error");
   const router = useRouter();
+  const isMounted = useMounted();
   const [isPending, setIsPending] = useState(false);
   const form = useZodForm(extendedValidation, {
     initialValues: {
@@ -132,7 +133,7 @@ export const LoginForm = ({ providers, oidcClientName, isOidcAutoLoginEnabled, c
 
                 {providers.includes("credentials") && (
                   <Stack gap="sm">
-                    <SubmitButton isPending={isPending} form={form} provider="credentials">
+                    <SubmitButton isMounted={isMounted} isPending={isPending} form={form} provider="credentials">
                       {t("action.login.label")}
                     </SubmitButton>
                     <PasswordForgottenCollapse username={form.values.name} />
@@ -140,7 +141,7 @@ export const LoginForm = ({ providers, oidcClientName, isOidcAutoLoginEnabled, c
                 )}
 
                 {providers.includes("ldap") && (
-                  <SubmitButton isPending={isPending} form={form} provider="ldap">
+                  <SubmitButton isMounted={isMounted} isPending={isPending} form={form} provider="ldap">
                     {t("action.login.labelWith", { provider: "LDAP" })}
                   </SubmitButton>
                 )}
@@ -151,7 +152,7 @@ export const LoginForm = ({ providers, oidcClientName, isOidcAutoLoginEnabled, c
         )}
 
         {providers.includes("oidc") && (
-          <Button fullWidth variant="light" onClick={async () => await signInAsync("oidc")}>
+          <Button fullWidth variant="light" disabled={!isMounted} onClick={async () => await signInAsync("oidc")}>
             {t("action.login.labelWith", { provider: oidcClientName })}
           </Button>
         )}
@@ -161,12 +162,13 @@ export const LoginForm = ({ providers, oidcClientName, isOidcAutoLoginEnabled, c
 };
 
 interface SubmitButtonProps {
+  isMounted: boolean;
   isPending: boolean;
   form: UseFormReturnType<FormType>;
   provider: "credentials" | "ldap";
 }
 
-const SubmitButton = ({ isPending, form, provider, children }: PropsWithChildren<SubmitButtonProps>) => {
+const SubmitButton = ({ isMounted, isPending, form, provider, children }: PropsWithChildren<SubmitButtonProps>) => {
   const isCurrentProviderActive = form.getValues().provider === provider;
 
   return (
@@ -176,7 +178,7 @@ const SubmitButton = ({ isPending, form, provider, children }: PropsWithChildren
       fullWidth
       onClick={() => form.setFieldValue("provider", provider)}
       loading={isPending && isCurrentProviderActive}
-      disabled={isPending && !isCurrentProviderActive}
+      disabled={!isMounted || (isPending && !isCurrentProviderActive)}
     >
       {children}
     </Button>
diff --git a/e2e/assistant-management.spec.ts b/e2e/assistant-management.spec.ts
index 025b1c820..df2c00f61 100644
--- a/e2e/assistant-management.spec.ts
+++ b/e2e/assistant-management.spec.ts
@@ -44,7 +44,7 @@ describe("Assistant management", () => {
       await page.getByLabel("Username").fill(adminCredentials.username);
       await page.locator("#password").fill(adminCredentials.password);
       await page.getByRole("button", { name: "Login" }).click();
-      await page.waitForURL(baseUrl, { timeout: 15_000 });
+      await expect(page).not.toHaveURL(/\/auth\/login/, { timeout: 30_000 });
 
       await page.goto(`${baseUrl}/manage/assistant`);
       await expect(page.getByRole("heading", { name: "Assistant" })).toBeVisible();