diff --git a/src/CrudKit/Pages/BasicLoginPage.php b/src/CrudKit/Pages/BasicLoginPage.php
index 64d34c5..0d86137 100644
--- a/src/CrudKit/Pages/BasicLoginPage.php
+++ b/src/CrudKit/Pages/BasicLoginPage.php
@@ -64,7 +64,7 @@ public function createLogoutLink () {
 		return $this->url->resetGetParams (array('__ckLogout' => true));
 	}
 
-	public function preprocess ($app) {
+	public function preprocess ($app = null) {
 		if ($this->url->get ('__ckLogout', false) !== false) {
 			$this->doLogout ();
 		}
@@ -106,4 +106,4 @@ function render()
         	]
     	);
     }
-}
\ No newline at end of file
+}