diff --git a/main/forum/newthread.php b/main/forum/newthread.php
index cb0ae34457..c26efcfa60 100755
--- a/main/forum/newthread.php
+++ b/main/forum/newthread.php
@@ -118,6 +118,11 @@ if ($current_forum['forum_of_group'] != 0) {
     }
 }
 
+// 6. Invited users can't create new threads
+if (api_is_invited_user()) {
+    api_not_allowed(true);
+}
+
 $session_toolgroup = 0;
 if ($origin == 'group') {
     $session_toolgroup = intval($_SESSION['toolgroup']);
diff --git a/main/forum/viewforum.php b/main/forum/viewforum.php
index 45355a1f46..592c10b689 100755
--- a/main/forum/viewforum.php
+++ b/main/forum/viewforum.php
@@ -295,7 +295,7 @@ if (api_is_allowed_to_edit(false, true) OR
     ($current_forum['allow_new_threads'] == 1 AND !isset($_user['user_id']) AND $current_forum['allow_anonymous'] == 1)
 ) {
     if ($current_forum['locked'] <> 1 AND $current_forum['locked'] <> 1) {
-        if (!api_is_anonymous()) {
+        if (!api_is_anonymous() && !api_is_invited_user()) {
             if ($my_forum == strval(intval($my_forum))) {
                 echo '<a href="'.$forumUrl.'newthread.php?'.api_get_cidreq().'&amp;forum='.Security::remove_XSS($my_forum).$origin_string.'">'.
                     Display::return_icon('new_thread.png',get_lang('NewTopic'),'',ICON_SIZE_MEDIUM).'</a>';