diff --git a/src/Exceptions/InternalException.php b/src/Exceptions/InternalException.php
new file mode 100644
index 0000000..53e2061
--- /dev/null
+++ b/src/Exceptions/InternalException.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Ycs77\LaravelWizard\Exceptions;
+
+use Exception;
+
+class InternalException extends Exception
+{
+    /**
+     * Undocumented function
+     *
+     * @param  string  $message
+     * @param  int  $code
+     * @param  Throwable|null  $previous
+     * @return mixed
+     */
+    public function __construct(string $message = '', int $code = 0, \Throwable $previous = null)
+    {
+        if (!config('app.debug')) {
+            abort($code);
+        }
+
+        return parent::__construct($message, $code, $previous);
+    }
+}
diff --git a/src/Exceptions/StepNotFoundException.php b/src/Exceptions/StepNotFoundException.php
index 7ad481b..e78682d 100644
--- a/src/Exceptions/StepNotFoundException.php
+++ b/src/Exceptions/StepNotFoundException.php
@@ -2,7 +2,27 @@
 
 namespace Ycs77\LaravelWizard\Exceptions;
 
-class StepNotFoundException extends \Exception
+class StepNotFoundException extends InternalException
 {
-    //
+    /**
+     * The step slug.
+     *
+     * @var string
+     */
+    protected $slug;
+
+    /**
+     * The wizard title.
+     *
+     * @var string
+     */
+    protected $wizardTitle;
+
+    public function __construct(string $wizardTitle, string $slug)
+    {
+        parent::__construct("Step [$slug] is not found to wizard $wizardTitle.", 404);
+
+        $this->slug = $slug;
+        $this->wizardTitle = $wizardTitle;
+    }
 }
diff --git a/src/Http/Controllers/WizardController.php b/src/Http/Controllers/WizardController.php
index 71da8ec..c1d0945 100644
--- a/src/Http/Controllers/WizardController.php
+++ b/src/Http/Controllers/WizardController.php
@@ -326,24 +326,20 @@ protected function getLastProcessedStepIndex(Request $request)
     protected function getWizardStep(Request $request, $slug)
     {
         /** @var \Ycs77\LaravelWizard\Step|null $step */
-        try {
-            if (isset($slug)) {
-                $step = $this->wizard()->stepRepo()->find($slug);
-            } else {
-                $lastProcessedStepIndex = $this->getLastProcessedStepIndex($request);
-                $step = $this->wizard()->stepRepo()->get($lastProcessedStepIndex);
-            }
+        if (isset($slug)) {
+            $step = $this->wizard()->stepRepo()->find($slug);
+        } else {
+            $lastProcessedStepIndex = $this->getLastProcessedStepIndex($request);
+            $step = $this->wizard()->stepRepo()->get($lastProcessedStepIndex);
+        }
 
-            if (is_null($step)) {
-                throw new StepNotFoundException();
-            }
+        if (is_null($step)) {
+            throw new StepNotFoundException($this->wizardTitle, $slug);
+        }
 
-            $this->wizard()->stepRepo()->setCurrentIndex($step->index());
+        $this->wizard()->stepRepo()->setCurrentIndex($step->index());
 
-            $step->setModel($request);
-        } catch (StepNotFoundException $e) {
-            abort(404);
-        }
+        $step->setModel($request);
 
         return $step;
     }
diff --git a/tests/Feature/HttpTest.php b/tests/Feature/HttpTest.php
index 9c99631..e4346e9 100644
--- a/tests/Feature/HttpTest.php
+++ b/tests/Feature/HttpTest.php
@@ -90,12 +90,21 @@ public function testRunAllWizardSteps()
         ]);
     }
 
-    public function testWizardFormThrowStepNotFoundException()
+    public function testThrowStepNotFoundException()
     {
+        $this->app['config']->set('app.debug', false);
+
         $response = $this->get('/wizard/test/step-not-found');
         $response->assertStatus(404);
     }
 
+    public function testThrowStepNotFoundExceptionFromDebugMode()
+    {
+        $response = $this->get('/wizard/test/step-not-found');
+        $response->assertStatus(500);
+        $response->assertSee('Step [step-not-found] is not found to wizard Test.');
+    }
+
     public function testWizardStepNotEquialToLastProcessedStep()
     {
         $this->session([
diff --git a/tests/Stubs/WizardControllerOptionsStub.php b/tests/Stubs/WizardControllerOptionsStub.php
index e6017f2..dc916d7 100644
--- a/tests/Stubs/WizardControllerOptionsStub.php
+++ b/tests/Stubs/WizardControllerOptionsStub.php
@@ -2,17 +2,8 @@
 
 namespace Ycs77\LaravelWizard\Test\Stubs;
 
-use Ycs77\LaravelWizard\Http\Controllers\WizardController;
-
-class WizardControllerOptionsStub extends WizardController
+class WizardControllerOptionsStub extends WizardControllerStub
 {
-    /**
-     * The wizard name.
-     *
-     * @var string
-     */
-    protected $wizardName = 'test';
-
     /**
      * The wizard options.
      *
@@ -23,24 +14,4 @@ class WizardControllerOptionsStub extends WizardController
     protected $wizardOptions = [
         'cache' => false,
     ];
-
-    /**
-     * The wizard steps instance.
-     *
-     * @var array
-     */
-    protected $steps = [
-        UserStepStub::class,
-        PostStepStub::class,
-    ];
-
-    /**
-     * Get controller main class name.
-     *
-     * @return string
-     */
-    public function getControllerClass()
-    {
-        return static::class;
-    }
 }
diff --git a/tests/Stubs/WizardControllerStub.php b/tests/Stubs/WizardControllerStub.php
index ea96cbf..943db35 100644
--- a/tests/Stubs/WizardControllerStub.php
+++ b/tests/Stubs/WizardControllerStub.php
@@ -13,6 +13,13 @@ class WizardControllerStub extends WizardController
      */
     protected $wizardName = 'test';
 
+    /**
+     * The wizard title.
+     *
+     * @var string
+     */
+    protected $wizardTitle = 'Test';
+
     /**
      * The wizard steps instance.
      *
diff --git a/tests/TestCase.php b/tests/TestCase.php
index c3ca24d..6064a31 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -34,6 +34,7 @@ protected function setUp()
     protected function getEnvironmentSetUp($app)
     {
         // App
+        $app['config']->set('app.debug', true);
         $app['config']->set('app.key', 'base64:tqASP1YzC4hhdT1nMEc+DFGMRq6WQmfMzYFW522Ce8g=');
 
         // Database