OS error 108: Cannot send after transport endpoint shutdown for thelio-io

[janemba]

Distribution (run cat /etc/os-release):

$ cat /etc/os-release
NAME=Slackware
VERSION="15.0"
ID=slackware
VERSION_ID=15.0
PRETTY_NAME="Slackware 15.0 x86_64"
ANSI_COLOR="0;34"
CPE_NAME="cpe:/o:slackware:slackware_linux:15.0"
HOME_URL="http://slackware.com/"
SUPPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
BUG_REPORT_URL="http://www.linuxquestions.org/questions/slackware-14/"
VERSION_CODENAME=stable

Related Application and/or Package Version (run apt policy $PACKAGE NAME):

https://github.com/pop-os/system76-firmware.git

Issue/Bug Description:

While running the cli binary I 'm getting the following error:

$ /usr/bin/system76-firmware-cli  thelio-io
downloading manifest.json
downloading metadata.json
downloading manifest.json
downloading metadata.json
downloading main.hex
Switching devices to bootloader
 "/sys/bus/usb/devices/1-5"
  revision: ""
  switching to bootloader
system76-firmware: failed to update: Cannot send after transport endpoint shutdown (os error 108)

Steps to reproduce (if you know):

$ git clone https://github.com/pop-os/system76-firmware.git
$ cd system76-firmware
$ make all
$ sudo make install
$ /usr/bin/system76-firmware-cli schedule
$ /usr/bin/system76-firmware-cli thelio-io

Only the last command trigger the issue.

Expected behavior:

Perform the update without error.

Other Notes: