Upon trying to build a new core-image-minimal for raspberrypi-4 with gatesgarth, the build never finishes, however, the server idles after some hours.
/home/user/yocto/poky/build-toaster-2/toaster_ui.log shows following errors / seems like a part of the build process crashed:

NOTE: Logfile for task /home/user/yocto/poky/build-toaster-2/tmp/work/raspberrypi4-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/log.do_image_complete.14330
NOTE: Logfile for task /home/user/yocto/poky/build-toaster-2/tmp/work/raspberrypi4-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/log.do_image_complete.14330
NOTE: Logfile for task /home/user/yocto/poky/build-toaster-2/tmp/work/raspberrypi4-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/log.do_populate_lic_deploy.14343
NOTE: Logfile for task /home/user/yocto/poky/build-toaster-2/tmp/work/raspberrypi4-poky-linux-gnueabi/core-image-minimal/1.0-r0/temp/log.do_populate_lic_deploy.14343
NOTE: Tasks Summary: Attempted 3334 tasks of which 5 didn't need to be rerun and all succeeded.
ERROR: expected string or bytes-like object
Traceback (most recent call last):
File "/home/user/yocto/poky/bitbake/lib/bb/ui/toasterui.py", line 362, in main
buildinfohelper.scan_image_artifacts()
File "/home/user/yocto/poky/bitbake/lib/bb/ui/buildinfohelper.py", line 1802, in scan_image_artifacts
image_name)
File "/usr/lib/python3.7/re.py", line 192, in sub
return _compile(pattern, flags).sub(repl, string, count)
TypeError: expected string or bytes-like object

WARNING: Return value is 1

How to fix this?