Failed to acquire RNG data: not found

Hi everyone! On a endeavourOS fresh install with systemd-boot, a strange line appears during boot, after choosing the kernel.
The message is:

Failed to acquire RNG data: not found.

The boot then continues normally and without errors, the system works as well. Can you explain what is that message, if it is a problem and how to possibly fix it?

Some have noted the error message going away, after a BIOS update.