array_push(): Argument #1 ($array)

[radosc]

Dear

I have:
VirtueMart 4.0.8 10748
PHP   7.4.26
Joomla! 3.10.11 Stable

When I change php to ver 8.* then in the backend after order status changing to "sent" I get error:
Error message data:
E_ERROR:1 0: array_push(): Argument #1 ($array) must be of type array, null given in file: /home/admin/domains/**********/public_html/libraries/vendor/tecnickcom/tcpdf/tcpdf.php line: 16933

timestamp: 2022-11-30T09:26:13+00:00

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Backtrace:
/home/admin/domains/*********/public_html/libraries/vendor/tecnickcom/tcpdf/tcpdf.php:16933

all tjhe best
Radek