From b08caf5813c43e8648cdf5db1e003b3046a37c2c Mon Sep 17 00:00:00 2001
From: alecpl <alec@alec.pl>
Date: Wed, 31 Aug 2011 08:49:44 -0400
Subject: [PATCH] - Applied fixes from trunk up to r5150

---
 program/include/rcmail.php |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index 1e13624..03b536b 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -413,7 +413,10 @@
         $id = '0';
 
     // use existing instance
-    if (isset($this->address_books[$id]) && is_a($this->address_books[$id], 'rcube_addressbook') && (!$writeable || !$this->address_books[$id]->readonly)) {
+    if (isset($this->address_books[$id]) && is_object($this->address_books[$id])
+      && is_a($this->address_books[$id], 'rcube_addressbook')
+      && (!$writeable || !$this->address_books[$id]->readonly)
+    ) {
       $contacts = $this->address_books[$id];
     }
     else if ($id && $ldap_config[$id]) {
@@ -1183,7 +1186,7 @@
       $this->smtp->disconnect();
 
     foreach ($this->address_books as $book) {
-      if (is_a($book, 'rcube_addressbook'))
+      if (is_object($book) && is_a($book, 'rcube_addressbook'))
         $book->close();
     }
 

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