diff --git a/admin/tool/log/classes/local/privacy/helper.php b/admin/tool/log/classes/local/privacy/helper.php
index 95c09e96b59..a90f1fc2cff 100644
--- a/admin/tool/log/classes/local/privacy/helper.php
+++ b/admin/tool/log/classes/local/privacy/helper.php
@@ -85,7 +85,7 @@ class helper {
         } else {
             $name = $record->eventname;
             $description = "Unknown event ({$name})";
-            $other = unserialize($record->other);
+            $other = \tool_log\helper\reader::decode_other($record->other);
         }
 
         $realuserid = $record->realuserid;
diff --git a/lib/classes/task/send_failed_login_notifications_task.php b/lib/classes/task/send_failed_login_notifications_task.php
index 6f7e123c6c2..7af752e995b 100644
--- a/lib/classes/task/send_failed_login_notifications_task.php
+++ b/lib/classes/task/send_failed_login_notifications_task.php
@@ -145,7 +145,7 @@ class send_failed_login_notifications_task extends scheduled_task {
             $a->time = userdate($log->timecreated);
             if (empty($log->username)) {
                 // Entries with no valid username. We get attempted username from the event's other field.
-                $other = unserialize($log->other);
+                $other = \tool_log\helper\reader::decode_other($log->other);
                 $a->info = empty($other['username']) ? '' : $other['username'];
                 $a->name = get_string('unknownuser');
             } else {