USB device plug in/out reports udev error

[fault-tolerant]

Using piCore 7.0, I've noticed that when stderr is redirected to stdout and a USB device (like keyboard, flash drive) is plugged in/out i can see the following udev error message:
udevd[xxxx]: failed to create queue file: No such file or directory
The devices work fine, by the way, and /run/udev folder is clearly writable.

[fault-tolerant]

This issue was happening only on one install I had. On others this doesn't happen, so forget about it.