From 20991add684a0a717deda5d66394b3382d5ff3c3 Mon Sep 17 00:00:00 2001
From: Patrick Teichmann <patrick.teichmann@limesurvey.org>
Date: Mon, 13 Sep 2021 12:20:10 +0200
Subject: [PATCH] Fixed issue #17592: database update 450 fails

---
 application/helpers/update/updatedb_helper.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/application/helpers/update/updatedb_helper.php b/application/helpers/update/updatedb_helper.php
index 3daac29d99c..01d311dd431 100644
--- a/application/helpers/update/updatedb_helper.php
+++ b/application/helpers/update/updatedb_helper.php
@@ -5229,7 +5229,7 @@ function decryptArchivedTables450($oDB)
         // recrypt tokens
         if ($archivedTableSettings['tbl_type'] === 'token') {
             // skip if the encryption status is unknown
-            if (isset($archivedTableSettingsProperties) && $archivedTableSettingsProperties[0] !== 'unknown') {
+            if (!empty($archivedTableSettingsProperties) && $archivedTableSettingsProperties[0] !== 'unknown') {
                 $tokenencryptionoptions = $archivedTableSettingsProperties;
 
                 // default attributes
@@ -5238,7 +5238,7 @@ function decryptArchivedTables450($oDB)
                 }
             }
             // skip if the encryption status is unknown
-            if (isset($archivedTableSettingsAttributes) && $archivedTableSettingsAttributes[0] !== 'unknown') {
+            if (!empty($archivedTableSettingsAttributes) && $archivedTableSettingsAttributes[0] !== 'unknown') {
                 // find custom attribute column names
                 $table = tableExists("{{{$archivedTableSettings['tbl_name']}}}");
                 if (!$table) {
@@ -5278,7 +5278,7 @@ function decryptArchivedTables450($oDB)
         }
 
         // recrypt responses // skip if the encryption status is unknown
-        if ($archivedTableSettings['tbl_type'] === 'response' && isset($archivedTableSettingsProperties) && $archivedTableSettingsProperties[0] !== 'unknown') {
+        if ($archivedTableSettings['tbl_type'] === 'response' && !empty($archivedTableSettingsProperties) && $archivedTableSettingsProperties[0] !== 'unknown') {
             $responsesCount = $oDB->createCommand()
                 ->select('count(*)')
                 ->from("{{{$archivedTableSettings['tbl_name']}}}")