Fix error when there's no writeable addressbook source (#1489162)

1 files changed, 7 insertions, 3 deletions

diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index d8d4372f9..59f4d55e1 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -275,9 +275,13 @@ function rcmail_contact_exists($email)
   if ($email) {
     // @TODO: search in all address books?
     $CONTACTS = $RCMAIL->get_address_book(-1, true);
-    $existing = $CONTACTS->search('email', $email, true, false);
-    if ($existing->count)
-      return true;
+
+    if (is_object($CONTACTS)) {
+      $existing = $CONTACTS->search('email', $email, true, false);
+      if ($existing->count) {
+        return true;
+      }
+    }
   }
 
   return false;