Uncaught Error: Undefined constant "MB_OVERLOAD_STRING"

[Volker Bäurer]

Steps:

1. Upgrading from 1.9.35-1 to 1.9.37 was successfully
   Parameters: Debian / bullseye + PHP7.4 -> Fully functioning

2. After upgrading to Debian / bookworm + PHP8.2 -> Error on perfdata:
   Fatal error: Uncaught Error: Undefined constant "MB_OVERLOAD_STRING" in /usr/local/pnp4nagios/lib/kohana/system/core/utf8.php:52 Stack trace: #0 /usr/local/pnp4nagios/lib/kohana/system/core/Bootstrap.php(32): require() #1 /usr/local/pnp4nagios/share/index.php(145): require('...') #2 {main} thrown in /usr/local/pnp4nagios/lib/kohana/system/core/utf8.php on line 52
   

I found this in the internet:
https://eusonlito.github.io/php-changes-cheatsheet/incompatible.html

[Volker Bäurer]

Wrong product. It is related to pnp4nagios