diff --git a/addressbook/inc/class.addressbook_groupdav.inc.php b/addressbook/inc/class.addressbook_groupdav.inc.php
index de28375334..b1363b6f88 100644
--- a/addressbook/inc/class.addressbook_groupdav.inc.php
+++ b/addressbook/inc/class.addressbook_groupdav.inc.php
@@ -208,6 +208,10 @@ class addressbook_groupdav extends groupdav_handler
 		// detect sync-collection report
 		$sync_collection_report = isset($filter[0]) && strpos($filter[0], 'contact_modified>') === 0;
 
+		if (isset($filter_in[self::$path_attr]) && !is_array($filter_in[self::$path_attr]))
+		{
+			$filter_in[self::$path_attr] = (array)$filter_in[self::$path_attr];
+		}
 		$requested_multiget_ids =& $filter_in[self::$path_attr];
 
 		$files = array();
diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index ec04e00686..f119d49d7b 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -263,7 +263,7 @@ class calendar_groupdav extends groupdav_handler
 			$filter['offset'] = $start[0];
 			$filter['num_rows'] = $start[1];
 		}
-		$requested_multiget_ids = $filter['query'][self::$path_attr];
+		$requested_multiget_ids = (array)$filter['query'][self::$path_attr];
 		$sync_collection = strpos($filter['query'][0],'cal_modified>') === 0 && $filter['filter'] == 'everything';
 
 		$events =& $this->bo->search($filter);
diff --git a/infolog/inc/class.infolog_groupdav.inc.php b/infolog/inc/class.infolog_groupdav.inc.php
index 5b344f3f25..3de86c27a8 100644
--- a/infolog/inc/class.infolog_groupdav.inc.php
+++ b/infolog/inc/class.infolog_groupdav.inc.php
@@ -254,7 +254,7 @@ class infolog_groupdav extends groupdav_handler
 			$offset = 0;
 		}
 
-		$requested_multiget_ids = $filter[self::$path_attr];
+		$requested_multiget_ids = (array)$filter[self::$path_attr];
 
 		$files = array();
 		// ToDo: add parameter to only return id & etag