diff --git a/core/components/minishop3/controllers/mgr/help.class.php b/core/components/minishop3/controllers/mgr/help.class.php
index 053270d31..9424913a5 100644
--- a/core/components/minishop3/controllers/mgr/help.class.php
+++ b/core/components/minishop3/controllers/mgr/help.class.php
@@ -27,17 +27,12 @@ public function getLanguageTopics()
      */
     public function loadCustomCssJs()
     {
-        // Vue CSS
+        // Config before Vue modules so mount sees ms3.config (#553).
+        $this->addVueConfig($this->ms3->config);
+
         $this->addCss($this->ms3->config['assetsUrl'] . 'css/mgr/vue-dist/primeicons.min.css');
         $this->addCss($this->ms3->config['assetsUrl'] . 'css/mgr/vue-dist/help.min.css');
-
-        // Vue module
         $this->addVueModule($this->ms3->config['jsUrl'] . 'mgr/vue-dist/help.min.js');
-
-        // Pass config to JavaScript
-        $this->addHtml('<script>
-            ms3.config = ' . json_encode($this->ms3->config) . ';
-        </script>');
     }
 
     /**
diff --git a/core/components/minishop3/tests/HelpVueEntryTest.php b/core/components/minishop3/tests/HelpVueEntryTest.php
new file mode 100644
index 000000000..fee417b8d
--- /dev/null
+++ b/core/components/minishop3/tests/HelpVueEntryTest.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * Help mgr page: Vue entry must declare `var ms3` via addVueConfig (#553).
+ *
+ * Run: php tests/HelpVueEntryTest.php
+ */
+
+declare(strict_types=1);
+
+$fail = static function (string $message): never {
+    fwrite(STDERR, "FAIL: {$message}\n");
+    exit(1);
+};
+
+$componentRoot = dirname(__DIR__);
+$repoRoot = dirname($componentRoot, 3);
+
+$tpl = $componentRoot . '/templates/default/help.tpl';
+$tplHtml = is_file($tpl) ? file_get_contents($tpl) : false;
+if ($tplHtml === false || !str_contains($tplHtml, 'id="ms3-vue-help"')) {
+    $fail('help.tpl must contain mount #ms3-vue-help');
+}
+
+$controllerPath = $componentRoot . '/controllers/mgr/help.class.php';
+$controller = file_get_contents($controllerPath);
+if ($controller === false) {
+    $fail('cannot read help controller');
+}
+
+foreach (['help\.min\.js', 'help\.tpl', 'addVueConfig', 'getTemplateFile'] as $pattern) {
+    if (preg_match('#' . $pattern . '#', $controller) !== 1) {
+        $fail("help controller must contain /{$pattern}/");
+    }
+}
+
+if (preg_match('#ms3\.config\s*=#', $controller) === 1) {
+    $fail('help controller must not assign ms3.config without declaring ms3 (#553)');
+}
+
+$configPos = strpos($controller, 'addVueConfig');
+$modulePos = strpos($controller, 'addVueModule');
+if ($configPos === false || $modulePos === false || $configPos > $modulePos) {
+    $fail('help controller must call addVueConfig() before addVueModule()');
+}
+
+$entry = $repoRoot . '/vueManager/src/entries/help.js';
+$entrySrc = is_file($entry) ? file_get_contents($entry) : false;
+if ($entrySrc === false || !str_contains($entrySrc, '#ms3-vue-help')) {
+    $fail('help entry must mount #ms3-vue-help');
+}
+
+fwrite(STDOUT, "OK HelpVueEntryTest\n");
+exit(0);