diff --git a/modules/kea/pages/index.php b/modules/kea/pages/index.php
index 8169e73..3d27b02 100644
--- a/modules/kea/pages/index.php
+++ b/modules/kea/pages/index.php
@@ -8,15 +8,11 @@ $pdo = modules()->modulePdo('kea', $fallback);
 $hosts = [];
 $error = null;
 
-if ($pdo) {
-    try {
-        $repo = new KeaHostRepository($pdo);
-        $hosts = $repo->findAll(50);
-    } catch (\Exception $e) {
-        $error = "Datenbankfehler: " . $e->getMessage();
-    }
-} else {
-    $error = "Modul nicht konfiguriert. Bitte Setup ausführen.";
+try {
+    $repo = new KeaHostRepository($pdo);
+    $hosts = $repo->findAll(50);
+} catch (\Exception $e) {
+    $error = "Datenbankfehler: " . $e->getMessage();
 }
 
 module_tpl('kea', 'dashboard', compact('hosts', 'error'));
diff --git a/public/index.php b/public/index.php
index 7b60658..e804356 100755
--- a/public/index.php
+++ b/public/index.php
@@ -111,8 +111,23 @@ if ($targetReal && $retoolBase && str_starts_with($targetReal, $retoolBase)) {
 // ------------------------------------
 // Erst Inhalt laden (ohne Ausgabe), damit Header/Redirects vor HTML funktionieren
 ob_start();
-require $target;
-$content = ob_get_clean();
+try {
+    require $target;
+    $content = ob_get_clean();
+} catch (\App\ModuleConfigException $e) {
+    ob_end_clean();
+    http_response_code(412);
+    $moduleName = $e->module();
+    $module = app()->modules()->get($moduleName);
+    $title = $module['title'] ?? $moduleName;
+    $setupUrl = '/modules/setup/' . rawurlencode($moduleName);
+    $content = '<div class="card">' .
+        '<div class="pill">' . e($title) . '</div>' .
+        '<h1 style="margin-top:.75rem;">Setup erforderlich</h1>' .
+        '<p class="muted">' . e($e->getMessage()) . '</p>' .
+        '<div style="margin-top:1rem;"><a class="nav-link" href="' . e($setupUrl) . '">Zum Setup</a></div>' .
+        '</div>';
+}
 
 // Wenn bereits Header gesendet wurden (z. B. eigener Redirect/Content-Type), Layout überspringen
 if (headers_sent()) {
diff --git a/src/App/ModuleConfigException.php b/src/App/ModuleConfigException.php
new file mode 100644
index 0000000..e09854a
--- /dev/null
+++ b/src/App/ModuleConfigException.php
@@ -0,0 +1,32 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+final class ModuleConfigException extends \RuntimeException
+{
+    private string $module;
+    private ?string $details;
+
+    public function __construct(
+        string $module,
+        string $message,
+        ?string $details = null,
+        int $code = 0,
+        ?\Throwable $previous = null
+    ) {
+        parent::__construct($message, $code, $previous);
+        $this->module = $module;
+        $this->details = $details;
+    }
+
+    public function module(): string
+    {
+        return $this->module;
+    }
+
+    public function details(): ?string
+    {
+        return $this->details;
+    }
+}
diff --git a/src/App/ModuleManager.php b/src/App/ModuleManager.php
index d769a3a..fae5206 100644
--- a/src/App/ModuleManager.php
+++ b/src/App/ModuleManager.php
@@ -113,7 +113,10 @@ final class ModuleManager
         $settings = $this->settings($name);
         $db = $settings['db'] ?? $fallback;
         if (!is_array($db) || empty($db)) {
-            return null;
+            throw new ModuleConfigException(
+                $name,
+                'Modul nicht konfiguriert. Bitte Setup ausfuehren.'
+            );
         }
 
         if (!isset($db['options'])) {
@@ -123,15 +126,49 @@ final class ModuleManager
             ];
         }
 
-        $pdo = Database::createFromArray($db);
+        try {
+            $pdo = Database::createFromArray($db);
+        } catch (\Throwable $e) {
+            if (defined('APP_DEBUG_TOOL') && APP_DEBUG_TOOL) {
+                @file_put_contents(
+                    __DIR__ . '/../../debug/module_db_error.log',
+                    '[' . date('c') . '] ' . $name . ': ' . $e->getMessage() . PHP_EOL,
+                    FILE_APPEND
+                );
+            }
+            throw new ModuleConfigException(
+                $name,
+                'Modul-Datenbank nicht korrekt konfiguriert.',
+                $e->getMessage(),
+                0,
+                $e
+            );
+        }
 
         if ($name === 'kea' && !empty($settings['kea_auto_init'])) {
-            Database::ensureKeaSchema($pdo, [
-                'auto_init' => true,
-                'init_cmd' => $settings['kea_init_cmd'] ?? null,
-                'init_script' => $settings['kea_init_script'] ?? null,
-                'kea_db_version' => $settings['kea_db_version'] ?? '',
-            ]);
+            try {
+                Database::ensureKeaSchema($pdo, [
+                    'auto_init' => true,
+                    'init_cmd' => $settings['kea_init_cmd'] ?? null,
+                    'init_script' => $settings['kea_init_script'] ?? null,
+                    'kea_db_version' => $settings['kea_db_version'] ?? '',
+                ]);
+            } catch (\Throwable $e) {
+                if (defined('APP_DEBUG_TOOL') && APP_DEBUG_TOOL) {
+                    @file_put_contents(
+                        __DIR__ . '/../../debug/module_db_error.log',
+                        '[' . date('c') . '] ' . $name . ': ' . $e->getMessage() . PHP_EOL,
+                        FILE_APPEND
+                    );
+                }
+                throw new ModuleConfigException(
+                    $name,
+                    'Modul-Datenbank nicht korrekt konfiguriert.',
+                    $e->getMessage(),
+                    0,
+                    $e
+                );
+            }
         }
 
         return $pdo;