Describe the bug

I install cacti 1.2.20 with php8.1 on ubuntu OS. However, I faced with the error:
2022-04-09 20:56:17 - CMDPHP PHP ERROR Backtrace: (/logout.php[26]:include(), /include/auth.php[27]:require_once(), /include/global.php[517]:include_once(), /include/global_arrays.php[697]:__(), /include/global_languages.php[507]:CactiErrorHandler())
2022-04-09 20:56:17 - ERROR PHP : Implicit conversion from float 5.5 to int loses precision in file: /var/www/html/cacti/include/global_languages.php on line: 516
Can you help me fix the bug above ?