diff --git a/addressbook/inc/class.addressbook_groupdav.inc.php b/addressbook/inc/class.addressbook_groupdav.inc.php
index d32b06965e..8f4eee0d32 100644
--- a/addressbook/inc/class.addressbook_groupdav.inc.php
+++ b/addressbook/inc/class.addressbook_groupdav.inc.php
@@ -672,6 +672,8 @@ class addressbook_groupdav extends groupdav_handler
 			if ($this->debug) error_log(__METHOD__."(,$id) save(".array2string($contact).") failed, Ok=$save_ok");
 			if ($save_ok === 0)
 			{
+				// honor Prefer: return=representation for 412 too (no need for client to explicitly reload)
+				$this->check_return_representation($options, $id, $user);
 				return '412 Precondition Failed';
 			}
 			return '403 Forbidden';	// happens when writing new entries in AB's without ADD rights
diff --git a/addressbook/inc/class.addressbook_vcal.inc.php b/addressbook/inc/class.addressbook_vcal.inc.php
index 4e31a44268..8d03d3ec35 100644
--- a/addressbook/inc/class.addressbook_vcal.inc.php
+++ b/addressbook/inc/class.addressbook_vcal.inc.php
@@ -929,7 +929,10 @@ class addressbook_vcal extends addressbook_bo
 				{
 					if (!empty($fieldName))
 					{
-						$value = trim($vcardValues[$vcardKey]['values'][$fieldKey]);
+						if (is_scalar($vcardValues[$vcardKey]['values'][$fieldKey]))
+						{
+							$value = trim($vcardValues[$vcardKey]['values'][$fieldKey]);
+						}
 						if ($pref_tel && (($vcardKey == $pref_tel) ||
 								($vcardValues[$vcardKey]['name'] == 'TEL') &&
 								($vcardValues[$vcardKey]['value'] == $vcardValues[$pref_tel]['value'])))
@@ -939,9 +942,9 @@ class addressbook_vcal extends addressbook_bo
 						switch($fieldName)
 						{
 							case 'bday':
-								$contact[$fieldName] = $vcardValues[$vcardKey]['values']['year'] .
-									'-' . $vcardValues[$vcardKey]['values']['month'] .
-									'-' . $vcardValues[$vcardKey]['values']['mday'];
+								$contact[$fieldName] = $vcardValues[$vcardKey]['value']['year'] .
+									'-' . $vcardValues[$vcardKey]['value']['month'] .
+									'-' . $vcardValues[$vcardKey]['value']['mday'];
 								break;
 
 							case 'private':