From b5a0b42b62cbdc06972e686d0af59b3e718abb8c Mon Sep 17 00:00:00 2001
From: Alan Knowles <alan@roojs.com>
Date: Tue, 17 Nov 2020 15:35:41 +0800
Subject: [PATCH] better check for empty links

---
 DataObjects/Mtrack_change.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/DataObjects/Mtrack_change.php b/DataObjects/Mtrack_change.php
index b4e6f63..259fc50 100644
--- a/DataObjects/Mtrack_change.php
+++ b/DataObjects/Mtrack_change.php
@@ -501,8 +501,8 @@ class Pman_MTrack_DataObjects_Mtrack_change extends DB_DataObject
                 if (in_array($k, $keys)) {
                     continue;
                 } 
-                $alinks = explode(':', $links[$k]);
-                if (isset($links[$k]) && $this->tablename() == array_shift($alinks)) {
+                $alinks = isset($links[$k])  ? explode(':', $links[$k]) : false;
+                if ($alinks && $this->tablename() == array_shift($alinks)) {
                     continue;
                 }
                 $ret += $this->add($fieldname .':'. $k, $new->{$k}, !$old ? '' :  $old->{$k});
-- 
2.39.2