Stub out except property.

app/Http/Middleware/VerifyCsrfToken.php

@@ -5,6 +5,15 @@ use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as BaseVerifier;
 
 class VerifyCsrfToken extends BaseVerifier
 {
+    /**
+     * The URIs that shoudl be excluded from CSRF verification.
+     *
+     * @var array
+     */
+    protected $except = [
+        //
+    ];
+
     /**
      * Handle an incoming request.
      *