1 files changed, 3 insertions, 3 deletions
diff --git a/Acl/Permission/BasicPermissionMap.php b/Acl/Permission/BasicPermissionMap.php
index 18006ff..b2bcf65 100644
--- a/Acl/Permission/BasicPermissionMap.php
+++ b/Acl/Permission/BasicPermissionMap.php
@@ -84,10 +84,10 @@ class BasicPermissionMap implements PermissionMapInterface
     /**
      * {@inheritDoc}
      */
-    public function getMasks($permission)
+    public function getMasks($permission, $object)
     {
         if (!isset($this->map[$permission])) {
-            throw new \InvalidArgumentException(sprintf('The permission "%s" is not supported by this implementation.', $permission));
+            return null;
         }
 
         return $this->map[$permission];
@@ -100,4 +100,4 @@ class BasicPermissionMap implements PermissionMapInterface
     {
         return isset($this->map[$permission]);
     }
-}
-\ No newline at end of file
+}