fatal exception for timezone in wp

[dme1sc]

wc-invoice.pdf - version 1.5.4; woocommerce 6.1.1

After creating my first few invoices, I cannot list the invoices any longer and get a fatal exception error. I also got this error when clicking the B2C checkbox and Payment Interval for yearly.
Invoices

Fatal error: Uncaught Exception: DateTimeZone::__construct(): Unknown or bad timezone () in /home/customer/www/mortonbusinessconsulting.com/public_html/wp-content/plugins/wc-invoice-pdf/menu/invoice-menu.php:120 Stack trace: #0 /home/customer/www/mortonbusinessconsulting.com/public_html/wp-content/plugins/wc-invoice-pdf/menu/invoice-menu.php(120): DateTimeZone->__construct('') #1 /home/customer/www/mortonbusinessconsulting.com/public_html/wp-includes/class-wp-hook.php(303): WCInvoicePdf\Menu\InvoiceMenu->DisplayInvoices('') #2 /home/customer/www/mortonbusinessconsulting.com/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters('', Array) #3 /home/customer/www/mortonbusinessconsulting.com/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #4 /home/customer/www/mortonbusinessconsulting.com/public_html/wp-admin/admin.php(259): do_action('wc-invoices_pag...') #5 {main} thrown in /home/customer/www/mortonbusinessconsulting.com/public_html/wp-content/plugins/wc-invoice-pdf/menu/invoice-menu.php on line 120

There has been a critical error on this website.

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I changed the timezone from UTC-5 to New York and that fixed it. Thought you might want to know...