gistfile1.diff

diff --git a/Document/UserManager.php b/Document/UserManager.php
index ef28089..c5d5b2d 100644
--- a/Document/UserManager.php
+++ b/Document/UserManager.php
@@ -19,11 +19,13 @@ class UserManager extends BaseUserManager
     {
         parent::__construct($encoder, $algorithm, $canonicalizer);
 
-        $this->dm = $dm;
-        $this->repository = $dm->getRepository($class);
+        if (class_exists($class)) {
+            $this->dm = $dm;
+            $this->repository = $dm->getRepository($class);
 
-        $metadata = $dm->getClassMetadata($class);
-        $this->class = $metadata->name;
+            $metadata = $dm->getClassMetadata($class);
+            $this->class = $metadata->name;
+        }
     }
 
     /**
diff --git a/Entity/UserManager.php b/Entity/UserManager.php
index 02ecf1c..c1ac0e4 100644
--- a/Entity/UserManager.php
+++ b/Entity/UserManager.php
@@ -19,11 +19,13 @@ class UserManager extends BaseUserManager
     {
         parent::__construct($encoder, $algorithm, $canonicalizer);
 
-        $this->em = $em;
-        $this->repository = $em->getRepository($class);
+        if (class_exists($class)) {
+          $this->em = $em;
+          $this->repository = $em->getRepository($class);
 
-        $metadata = $em->getClassMetadata($class);
-        $this->class = $metadata->name;
+          $metadata = $em->getClassMetadata($class);
+          $this->class = $metadata->name;
+        }
     }
 
     /**
diff --git a/FOSUserBundle.php b/FOSUserBundle.php
index 4103ed8..9960cf6 100644
--- a/FOSUserBundle.php
+++ b/FOSUserBundle.php
@@ -16,8 +16,11 @@ class FOSUserBundle extends Bundle
 {
     public function boot()
     {
+      
         $class = $this->container->get('fos_user.user_manager')->getClass();
-        call_user_func(array($class, 'setCanonicalizer'), $this->container->get('fos_user.util.canonicalizer'));
+        if ($class) {
+            call_user_func(array($class, 'setCanonicalizer'), $this->container->get('fos_user.util.canonicalizer'));
+        }
     }
 
     public function getNamespace()