diff --git a/src/Auth/DatabaseUserProvider.php b/src/Auth/DatabaseUserProvider.php
index 1a908f9..95f0683 100644
--- a/src/Auth/DatabaseUserProvider.php
+++ b/src/Auth/DatabaseUserProvider.php
@@ -91,10 +91,12 @@ public function updateRememberToken(Authenticatable $user, $token)
      */
     public function retrieveByCredentials(array $credentials)
     {
+        $user = null;
+
         try {
             $user = Resolver::byCredentials($credentials);
         } catch (BindException $e) {
-            if (!$this->isFallingBack()) {
+            if (! $this->isFallingBack()) {
                 throw $e;
             }
         }