diff --git a/components/errors/ErrorBoundary.vue b/components/errors/ErrorBoundary.vue
new file mode 100644
index 0000000..8e1bdfb
--- /dev/null
+++ b/components/errors/ErrorBoundary.vue
@@ -0,0 +1,65 @@
+<template>
+    <slot name="error" v-if="error" v-bind="{ error }">
+        <div id="error" class="grid min-h-screen place-items-center px-6 py-24 sm:py-32 lg:px-8">
+            <div class="text-center prose prose-invert">
+                <p class="text-base font-semibold text-pink-400">404</p>
+                <h1 class="mt-4 text-3xl font-bold tracking-tight text-gray-100 sm:text-5xl">{{ error.title }}
+                </h1>
+                <p class="mt-6 text-base leading-7 text-gray-400" v-html="error.message"></p>
+                <div class="mt-10 grid grid-cols-2 gap-x-6 mx-auto max-w-md">
+                    <ButtonsPrimary class="w-full" @click="back">Go back</ButtonsPrimary>
+                    <a href="https://github.com/lysand-org/lysand-fe/issues" target="_blank">
+                        <ButtonsSecondary class="w-full">Report an issue</ButtonsSecondary>
+                    </a>
+                </div>
+            </div>
+        </div>
+    </slot>
+    <slot v-else />
+</template>
+
+<script lang="ts" setup>
+const error = ref<{
+    title: string;
+    message: string;
+    code: string;
+} | null>(null);
+
+useListen("error", (err) => {
+    error.value = err;
+});
+
+const back = () => {
+    useRouter().back();
+};
+
+useHead({
+    title: computed(() => error.value?.title || "Error"),
+});
+</script>
+
+<style>
+#error code:not(pre code)::after,
+#error code:not(pre code)::before {
+    content: ""
+}
+
+#error code:not(pre code) {
+    border-radius: .25rem;
+    padding: .25rem .5rem;
+    word-wrap: break-word;
+    background: transparent;
+    background-color: #ffffff0d;
+    -webkit-hyphens: none;
+    hyphens: none;
+    margin-top: 1rem;
+    -moz-tab-size: 4;
+    -o-tab-size: 4;
+    tab-size: 4;
+    --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);
+    --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color);
+    box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), 0 0 #0000;
+    box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow, 0 0 #0000);
+    --tw-ring-color: hsla(0, 0%, 100%, .1)
+}
+</style>
\ No newline at end of file
diff --git a/composables/EventBus.ts b/composables/EventBus.ts
index 4c90ae9..3e245c8 100644
--- a/composables/EventBus.ts
+++ b/composables/EventBus.ts
@@ -31,6 +31,11 @@ type ApplicationEvents = {
     "notification:new": NotificationEvent;
     "attachment:view": Attachment;
     "identity:change": Identity;
+    error: {
+        code: string;
+        title: string;
+        message: string;
+    } | null;
 };
 
 const emitter = mitt<ApplicationEvents>();
diff --git a/layouts/app.vue b/layouts/app.vue
index 64dc8f4..bcfa587 100644
--- a/layouts/app.vue
+++ b/layouts/app.vue
@@ -14,6 +14,7 @@
             <rect width="100%" height="100%" stroke-width="0" fill="url(#983e3e4c-de6d-4c3f-8d64-b9761d1534cc)"></rect>
         </svg>
         <LazySidebarsNavigation />
+
         <div class="relative md:pl-20 min-h-dvh flex flex-row overflow-hidden justify-center xl:justify-between">
             <OverlayScrollbarsComponent :defer="true" class="w-full max-h-dvh overflow-y-auto" :element="'main'">
                 <slot />
@@ -64,12 +65,12 @@ const client = useClient();
 const providers = useSSOConfig();
 
 watchEffect(async () => {
-    if (n.value) {
+    if (n?.value) {
         // Wait 50ms
         await new Promise((resolve) => setTimeout(resolve, 50));
         useEvent("composer:open");
     }
-    if (o_i_d_c.value) {
+    if (o_i_d_c?.value) {
         useEvent("notification:new", {
             type: "progress",
             title: "Linking your account",
diff --git a/pages/[username]/index.vue b/pages/[username]/index.vue
index b162122..ec97e52 100644
--- a/pages/[username]/index.vue
+++ b/pages/[username]/index.vue
@@ -1,10 +1,12 @@
 <template>
-    <div class="mx-auto max-w-2xl w-full">
-        <LazyTimelinesTimelineScroller>
-            <LazySocialElementsUsersAccount :account="account ?? undefined" />
-            <LazyTimelinesAccount :id="accountId" :key="accountId" />
-        </LazyTimelinesTimelineScroller>
-    </div>
+    <ErrorsErrorBoundary>
+        <div class="mx-auto max-w-2xl w-full">
+            <LazyTimelinesTimelineScroller>
+                <LazySocialElementsUsersAccount :account="account ?? undefined" />
+                <LazyTimelinesAccount :id="accountId" :key="accountId" />
+            </LazyTimelinesTimelineScroller>
+        </div>
+    </ErrorsErrorBoundary>
 </template>
 
 <script setup lang="ts">
@@ -19,6 +21,17 @@ const client = useClient();
 const username = (route.params.username as string).replace("@", "");
 
 const accounts = useAccountSearch(client, username);
+watch(accounts, (newValue) => {
+    if (Array.isArray(newValue)) {
+        if (!newValue.find((account) => account.acct === username)) {
+            useEvent("error", {
+                title: "Account not found",
+                message: `The account <code>@${username}</code> does not exist.`,
+                code: "ERR_ACCOUNT_NOT_FOUND",
+            });
+        }
+    }
+});
 const account = computed<Account | null>(
     () => accounts.value?.find((account) => account.acct === username) ?? null,
 );