Invalid type error messages

[ikke-t]

[x]: This is a bug and not a question.

[x]: I understand that the best way to resolve this issue is to solve it and propose a Pull Request.

Describe the bug**

There is constant warning of invalid variable types in logs.

To Reproduce**

Steps to reproduce the behavior:

1. Start the container (is not related to container though)
2. Visit /Web

Expected behavior**

No logs

Screenshots**

[Tue Mar 03 20:42:28.223907 2026] [php:notice] [pid 94:tid 94] [client 10.128.0.2:46546] [CONFIG] Invalid type for 'reservation.default.start.reminder'. Should be 'string', using default., referer: http://10.128.0.33:8080/Web
[Tue Mar 03 20:42:28.223939 2026] [php:notice] [pid 94:tid 94] [client 10.128.0.2:46546] [CONFIG] Invalid type for 'reservation.default.end.reminder'. Should be 'string', using default., referer: http://10.128.0.33:8080/Web

Additional context**

This is harmless, but prints out useless logs into host.

Specifications

• LibreBooking version (or SHA if using the develop branch): 4.2.0