diff --git a/frontend/spa/src/WrongPlatformError.vue b/frontend/spa/src/WrongPlatformError.vue
new file mode 100644
index 0000000..8d32b65
--- /dev/null
+++ b/frontend/spa/src/WrongPlatformError.vue
@@ -0,0 +1,19 @@
+<template>
+  <div style="z-index: 99999" class="fixed top-0 left-0 w-full h-full bg-base-100">
+    <div class="flex flex-col items-center justify-center h-full">
+      <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="size-18">
+        <path stroke-linecap="round" stroke-linejoin="round" d="M15 12H9m12 0a9 9 0 1 1-18 0 9 9 0 0 1 18 0Z" />
+      </svg>
+
+      <h1 class="font-semibold text-2xl mb-2">Магазин работает только внутри Telegram.</h1>
+    </div>
+  </div>
+</template>
+
+<script setup>
+const props = defineProps({
+  error: Error,
+});
+</script>
+
+
diff --git a/frontend/spa/src/errors.js b/frontend/spa/src/errors.js
new file mode 100644
index 0000000..82eec4a
--- /dev/null
+++ b/frontend/spa/src/errors.js
@@ -0,0 +1,30 @@
+class AppError extends Error {
+  constructor(message, code = 'APP_ERROR') {
+    super(message);
+    this.name = this.constructor.name;
+    this.code = code;
+
+    // важно для наследования Error
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, this.constructor);
+    }
+  }
+}
+
+class MaintenanceError extends AppError {
+  constructor(message = 'Application is under maintenance') {
+    super(message, 'MAINTENANCE');
+  }
+}
+
+class TelegramInitDataError extends AppError {
+  constructor(message = 'Application must be opened inside Telegram') {
+    super(message, 'NO_INIT_DATA');
+  }
+}
+
+export {
+  AppError,
+  MaintenanceError,
+  TelegramInitDataError,
+};
diff --git a/frontend/spa/src/main.js b/frontend/spa/src/main.js
index 02683e2..a654310 100644
--- a/frontend/spa/src/main.js
+++ b/frontend/spa/src/main.js
@@ -21,6 +21,8 @@ import {defaultConfig, plugin} from '@formkit/vue';
 import config from './formkit.config.js';
 import {TC_PULSE_EVENTS} from "@/constants/tPulseEvents.js";
 import {usePulseStore} from "@/stores/Pulse.js";
+import {TelegramInitDataError} from '@/errors.js';
+import WrongPlatformError from "@/WrongPlatformError.vue";
 
 register();
 
@@ -41,7 +43,7 @@ const appLoading = createApp(AppLoading);
 appLoading.mount('#app');
 
 function setTelegramUIColors() {
-    const daisyUIBgColor = getCssVarOklchRgb('--color-base-100');
+    const daisyUIBgColor = getCssVarOklchRgb('--color-base-200');
     window.Telegram.WebApp.setHeaderColor(daisyUIBgColor);
     window.Telegram.WebApp.setBackgroundColor(daisyUIBgColor);
 }
@@ -56,7 +58,7 @@ settings.load()
     .then(() => settings.ya_metrika_enabled && injectYaMetrika())
     .then(() => {
         if (! window.Telegram.WebApp.initData) {
-            throw new Error('Invalid init data. Application not in Telegram View');
+            throw new TelegramInitDataError('Invalid init data. Application not in Telegram View');
         }
     })
     .then(() => pulse.initFromStartParams())
@@ -113,7 +115,18 @@ settings.load()
     })
     .then(() => window.Telegram.WebApp.ready())
     .catch(error => {
-        console.error(error);
-        const errorApp = createApp(ApplicationError, {error});
+        const code = error.code ?? error.response._data.code;
+        let ErrorComponent;
+
+        switch (code) {
+            case 'NO_INIT_DATA':
+                ErrorComponent = WrongPlatformError;
+                break;
+
+            default:
+                ErrorComponent = ApplicationError;
+        }
+
+        const errorApp = createApp(ErrorComponent, { error });
         errorApp.mount('#app-error');
     });
diff --git a/module/oc_telegram_shop/upload/oc_telegram_shop/src/Exceptions/CustomExceptionHandler.php b/module/oc_telegram_shop/upload/oc_telegram_shop/src/Exceptions/CustomExceptionHandler.php
index ddd2303..7c7b670 100755
--- a/module/oc_telegram_shop/upload/oc_telegram_shop/src/Exceptions/CustomExceptionHandler.php
+++ b/module/oc_telegram_shop/upload/oc_telegram_shop/src/Exceptions/CustomExceptionHandler.php
@@ -14,7 +14,10 @@ class CustomExceptionHandler implements ExceptionHandlerInterface
     public function respond(Throwable $exception): ?JsonResponse
     {
         if ($exception instanceof TelegramInvalidSignatureException) {
-            return new JsonResponse(['error' => 'Invalid Signature'], Response::HTTP_BAD_REQUEST);
+            return new JsonResponse([
+                'error' => 'Invalid Signature',
+                'code' => 'NO_INIT_DATA',
+            ], Response::HTTP_BAD_REQUEST);
         }
 
         return null;