diff --git a/api/src/Vfs/Sharing.php b/api/src/Vfs/Sharing.php
index bd4f206fc6..1130c1aa1f 100644
--- a/api/src/Vfs/Sharing.php
+++ b/api/src/Vfs/Sharing.php
@@ -488,7 +488,7 @@ class Sharing
 				$async = new Api\Asyncservice();
 				if (!$async->read('egw_sharing-tmp-cleanup'))
 				{
-					$async->set_timer(array('day' => 28),'egw_sharing-tmp_cleanup','egw_sharing::tmp_cleanup',null);
+					$async->set_timer(array('day' => 28),'egw_sharing-tmp_cleanup','EGroupware\\Api\\Vfs\\Sharing::tmp_cleanup',null);
 				}
 			}
 
@@ -605,11 +605,11 @@ class Sharing
 			);
 			if (($group_concat = self::$db->group_concat('share_id'))) $cols[] = $group_concat.' AS share_id';
 			// remove expired tmp-files unconditionally
-			$having = 'HAVING share_expires < '.self::$db->quote(self::$db->to_timestamp(time())).' OR '.
+			$having = 'HAVING MAX(share_expires) < '.self::$db->quote(self::$db->to_timestamp(time())).' OR '.
 				// remove without expiration date, when created over 100 days ago AND
-				'share_expires IS NULL AND share_created < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)). ' AND '.
+				'MAX(share_expires) IS NULL AND MAX(share_created) < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)). ' AND '.
 					// (last accessed over 100 days ago OR never)
-					'(share_last_accessed IS NULL OR share_last_accessed < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)).')';
+					'(MAX(share_last_accessed) IS NULL OR MAX(share_last_accessed) < '.self::$db->quote(self::$db->to_timestamp(time()-self::TMP_KEEP)).')';
 
 			foreach(self::$db->select(self::TABLE, $cols, array(
 				"share_path LIKE '/home/%/.tmp/%'",
@@ -638,7 +638,7 @@ class Sharing
 			}
 		}
 		catch (\Exception $e) {
-			unset($e);
+			_egw_log_exception($e);
 		}
 		Vfs::$is_root = false;
 	}