E_ERROR

The following error occurred in WordPress 6.9.4 and SlimStat Analytics 5.4.1.
Updating to version 5.4.2 did not resolve the issue.

エラー詳細
===============
エラータイプ E_ERROR が /wp-content/plugins/wp-slimstat/src/Helpers/DataBuckets.php ファイルの 118 行目で発生しました。 エラーメッセージ: Uncaught Error: Call to undefined function SlimStat\Helpers\jddayofweek() in /wp-content/plugins/wp-slimstat/src/Helpers/DataBuckets.php:118
Stack trace:
#0 /wp-content/plugins/wp-slimstat/src/Helpers/DataBuckets.php(73): SlimStat\Helpers\DataBuckets->initSeqWeek()
#1 /wp-content/plugins/wp-slimstat/src/Helpers/DataBuckets.php(60): SlimStat\Helpers\DataBuckets->initBuckets()
#2 /wp-content/plugins/wp-slimstat/src/Modules/Chart.php(525): SlimStat\Helpers\DataBuckets->__construct()
#3 /wp-content/plugins/wp-slimstat/src/Modules/Chart.php(222): SlimStat\Modules\Chart->processResults()
#4 /wp-content/plugins/wp-slimstat/src/Modules/Chart.php(123): SlimStat\Modules\Chart->fetchChartData()
#5 /wp-content/plugins/wp-slimstat/src/Modules/Chart.php(38): SlimStat\Modules\Chart->init()
#6 /wp-content/plugins/wp-slimstat/admin/view/wp-slimstat-reports.php(1492): SlimStat\Modules\Chart->showChart()
#7 /wp-content/plugins/wp-slimstat/admin/view/wp-slimstat-reports.php(1078): wp_slimstat_reports::show_chart()
#8 /wp-admin/includes/template.php(1453): wp_slimstat_reports::callback_wrapper()
#9 /wp-admin/includes/dashboard.php(271): do_meta_boxes()
#10 /wp-admin/index.php(204): wp_dashboard()
#11 {main}
  thrown