From 834764e31645de1a8672f5cc36eaed7161ef523e Mon Sep 17 00:00:00 2001
From: Frode Petterson <frode.andre.petterson@gmail.com>
Date: Wed, 20 May 2015 10:55:02 +0200
Subject: [PATCH] Eliminate warnings.

---
 h5p.classes.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/h5p.classes.php b/h5p.classes.php
index 2f6d31d..72be902 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -2593,7 +2593,7 @@ class H5PContentValidator {
     }
 
     // Check if string is according to optional regexp in semantics
-    if (!($text === '' && $semantics->optional) && isset($semantics->regexp)) {
+    if (!($text === '' && isset($semantics->optional) && $semantics->optional) && isset($semantics->regexp)) {
       // Escaping '/' found in patterns, so that it does not break regexp fencing.
       $pattern = '/' . str_replace('/', '\\/', $semantics->regexp->pattern) . '/';
       $pattern .= isset($semantics->regexp->modifiers) ? $semantics->regexp->modifiers : '';