diff --git a/rule/ftpsyncfiles/rule_class.php b/rule/ftpsyncfiles/rule_class.php
index c6dc45c6..bd32fef4 100644
--- a/rule/ftpsyncfiles/rule_class.php
+++ b/rule/ftpsyncfiles/rule_class.php
@@ -75,7 +75,7 @@ class datalynx_rule_ftpsyncfiles extends datalynx_rule_base {
      * @var mixed
      */
     private array $sftpsetting;
-    private int $filefieldid;
+    private ?int $filefieldid;
     private array $files;
 
     /**
@@ -86,12 +86,14 @@ class datalynx_rule_ftpsyncfiles extends datalynx_rule_base {
      */
     public function __construct($df = 0, $rule = 0) {
         parent::__construct($df, $rule);
-        $this->sftpsetting = unserialize($this->rule->param2);
-        $this->sftpserver = $this->sftpsetting['sftpserver'];
-        $this->sftpport = $this->sftpsetting['sftpport'];
-        $this->sftpusername = $this->sftpsetting['sftpusername'];
-        $this->sftppassword = $this->sftpsetting['sftppassword'];
-        $this->sftppath = $this->sftpsetting['sftppath'];
+        if (isset($this->rule->param2)) {
+            $this->sftpsetting = unserialize($this->rule->param2);
+            $this->sftpserver = $this->sftpsetting['sftpserver'];
+            $this->sftpport = $this->sftpsetting['sftpport'];
+            $this->sftpusername = $this->sftpsetting['sftpusername'];
+            $this->sftppassword = $this->sftpsetting['sftppassword'];
+            $this->sftppath = $this->sftpsetting['sftppath'];
+        }
         $this->matchingfield = $this->rule->param7;
         $this->teammemberfieldid = $this->rule->param8;
         $this->authorid = $this->rule->param9;