Undefined variable error

Undefined variable error

If I select Disable CSS3 Animations and Script Functions in the Mega Menu Options, an error message appears on the frontend page.

Undefined variable $animOut in
.../modules/mod_djmegamenu/mod_djmegamenu.php
online 161

I use the free version of Mega Menu 4.3.3
Joomla 4.0.6
PHP 8.0.14

What is the right way to improve it?
Thank you