diff --git a/plugins/dynamix/DashStats.page b/plugins/dynamix/DashStats.page
index afb8aabc2..f3a86ca28 100644
--- a/plugins/dynamix/DashStats.page
+++ b/plugins/dynamix/DashStats.page
@@ -69,7 +69,7 @@ $parity = $var['mdResync'];
 $mover = file_exists('/var/run/mover.pid');
 $btrfs = exec('pgrep -cf /sbin/btrfs');
 $dot = $display['number'][0];
-$zfs = false;
+$zfs = file_exists('/proc/spl/kstat/zfs/arcstats');
 
 foreach ($disks as $disk) {
   switch ($disk['type']) {
@@ -87,7 +87,6 @@ foreach ($disks as $disk) {
       $cache_type[$name] = $disk['rotational'] ? ($disk['luksState'] ? 'disk-encrypted' : 'disk') : 'nvme';
       $cache_rate[$name] = number_format(100*$cache_used[$name]/($cache_size[$name] ?: 1),1,$dot,'');
       if (!$disks[$name]['devices']) unset($pools[array_search($name,$pools)]);
-      if (isset($disks[$name]['fsType']) && strpos($disks[$name]['fsType'],'zfs')!==false) $zfs = true;
     }
     break;
   }
diff --git a/plugins/dynamix/include/update.file.php b/plugins/dynamix/include/update.file.php
index 2c5f57acd..93eb2e806 100644
--- a/plugins/dynamix/include/update.file.php
+++ b/plugins/dynamix/include/update.file.php
@@ -1,6 +1,6 @@
 <?PHP
-/* Copyright 2005-2020, Lime Technology
- * Copyright 2012-2020, Bergware International.
+/* Copyright 2005-2023, Lime Technology
+ * Copyright 2012-2023, Bergware International.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2,
@@ -11,9 +11,11 @@
  */
 ?>
 <?
-write_log("Saving file $file");
-exec("mkdir -p ".escapeshellarg(dirname($file)));
-file_put_contents($file, str_replace(["\r\n","\r"], "\n", $_POST['text']));
+if ($file) {
+  write_log("Saving file $file");
+  exec("mkdir -p ".escapeshellarg(dirname($file)));
+  file_put_contents($file, str_replace(["\r\n","\r"], "\n", $_POST['text']));
+}
 // discard settings
 $save = false;
 ?>
diff --git a/plugins/dynamix/nchan/update_1 b/plugins/dynamix/nchan/update_1
index 95c960e80..429a33e96 100755
--- a/plugins/dynamix/nchan/update_1
+++ b/plugins/dynamix/nchan/update_1
@@ -23,7 +23,7 @@ while (true) {
   exec("sensors -uA 2>/dev/null|grep -Po 'fan\d_input: \K\d+'",$rpms);
   [$total,$free] = $memory;
   $used = $total-$free;
-  $zfs = (exec("awk '/^size/{print \$3}' /proc/spl/kstat/zfs/arcstats 2>/dev/null")?:0)/1024;
+  $zfs = (exec("awk '/^size/{print \$3;exit}' /proc/spl/kstat/zfs/arcstats 2>/dev/null")?:0)/1024;
   $info = max(round(100*(1-$free/$total)),0)."%\0".round(100*$zfs/$used)."%\0".implode("\0",$sys);
   $rpms = count($rpms) ? implode(" RPM\0",$rpms).' RPM' : '';
 
diff --git a/update.php b/update.php
index bd0bda501..1bc3cbeba 100644
--- a/update.php
+++ b/update.php
@@ -1,6 +1,6 @@
 <?PHP
-/* Copyright 2005-2016, Lime Technology
- * Copyright 2012-2016, Bergware International.
+/* Copyright 2005-2023, Lime Technology
+ * Copyright 2012-2023, Bergware International.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version 2,
@@ -44,12 +44,12 @@ $docroot = $_SERVER['DOCUMENT_ROOT'];
 if (isset($_POST['#file'])) {
   $file = $_POST['#file'];
   // prepend with boot (flash) if path is relative
-  if ($file[0]!='/') $file = "/boot/config/plugins/$file";
-  $section = isset($_POST['#section']) ? $_POST['#section'] : false;
+  if ($file && $file[0]!='/') $file = "/boot/config/plugins/$file";
+  $section = $_POST['#section'] ?? false;
   $cleanup = isset($_POST['#cleanup']);
-  $default = isset($_POST['#default']) ? @parse_ini_file("$docroot/plugins/".basename(dirname($file))."/default.cfg", $section) : array();
+  $default = ($file && isset($_POST['#default'])) ? @parse_ini_file("$docroot/plugins/".basename(dirname($file))."/default.cfg", $section) : [];
 
-  $keys = @parse_ini_file($file, $section);
+  $keys = @parse_ini_file($file, $section) ?: [];
   // the 'save' switch can be reset by the include file to disallow settings saving
   $save = true;
   if (isset($_POST['#include'])) {
@@ -62,13 +62,13 @@ if (isset($_POST['#file'])) {
   if ($save) {
     $text = "";
     if ($section) {
-      foreach ($_POST as $key => $value) if ($key[0]!='#') $keys[$section][$key] = isset($default[$section][$key]) ? $default[$section][$key] : $value;
+      foreach ($_POST as $key => $value) if ($key[0]!='#') $keys[$section][$key] = $default[$section][$key] ?? $value;
       foreach ($keys as $section => $block) {
         $text .= "[$section]\n";
         foreach ($block as $key => $value) if (strlen($value) || !$cleanup) $text .= "$key=\"$value\"\n";
       }
     } else {
-      foreach ($_POST as $key => $value) if ($key[0]!='#') $keys[$key] = isset($default[$key]) ? $default[$key] : $value;
+      foreach ($_POST as $key => $value) if ($key[0]!='#') $keys[$key] = $default[$key] ?? $value;
       foreach ($keys as $key => $value) if (strlen($value) || !$cleanup) $text .= "$key=\"$value\"\n";
     }
     @mkdir(dirname($file));