Fix #64, thanks @diezztsk

Author: youchenlee

src/views/index.blade.php

@@ -68,7 +68,7 @@
                   </div>
                 </nav>
 
-                @if ($errors->any())
+                @if (isset($errors) && $errors->any())
                 <div class="row">
                   <div class="col-md-12">
                     <div class="alert alert-danger" role="alert">