fixed small error

git-svn-id: https://plugins.svn.wordpress.org/twig/trunk@985356 b8457f37-d9ea-0310-8a92-e5e31aec5664
Trying to fix problem on older PHP versions

git-svn-id: https://plugins.svn.wordpress.org/twig/trunk@985368 b8457f37-d9ea-0310-8a92-e5e31aec5664