fixed warning when no referer available; merged from MOODLE_16_STABLE

diff --git a/mod/forum/post.php b/mod/forum/post.php
index 74af5d1505a069705cc67029c8d81a2ea826421f..6d6b62b42e5d100e9a87c4d7961e189139ee938b 100644 (file)
--- a/mod/forum/post.php
+++ b/mod/forum/post.php
@@ -372,7 +372,11 @@
     } else if (!empty($forum)) {
 /// User is starting a new discussion in a forum
 
-        $SESSION->fromurl = $_SERVER["HTTP_REFERER"];
+        if (!empty($_SERVER["HTTP_REFERER"])) {
+            $SESSION->fromurl = $_SERVER["HTTP_REFERER"];
+        } else {
+            $SESSION->fromurl = '';
+        }
 
         if (! $forum = get_record("forum", "id", $forum)) {
             error("The forum number was incorrect ($forum)");