diff --git a/app/Http/Controllers/SystemController.php b/app/Http/Controllers/SystemController.php
index b3d9739..7947d4b 100644
--- a/app/Http/Controllers/SystemController.php
+++ b/app/Http/Controllers/SystemController.php
@@ -49,10 +49,12 @@ class SystemController extends Controller
 				->transform(function($item) { $item['active'] = Arr::get($item,'active',FALSE); return $item; });
 
 			$o->mailers()->sync($mailers);
-			if ($request->post('users') && array_filter($request->post('users'),function($item) { return $item; }))
-				$o->users()->sync($request->post('users'));
-			else
-				$o->users()->detach();
+			if ($request->post('users')) {
+				if (array_filter($request->post('users'),function($item) { return $item; }))
+					$o->users()->sync($request->post('users'));
+				else
+					$o->users()->detach();
+			}
 
 			return redirect()->to('system');
 		}