This seems another instance of the bug. Daemon version: $ ls -l /run/current-system/profile/bin/guix-daemon /run/current-system/profile/bin/guix-daemon -> /gnu/store/pv9i296wfjl3zwkmsg4w24ksqcb9qhnb-guix-1.3.0-2.9f2b2c4/bin/guix-daemon During "guix build guix": /gnu/store/3j9kzhsygg56pmhlwpvjqicvjgsni49w-guix-1.3.0-3.50dfbbf vervangen... guix substitute: warning: [removed].local: host not found: Systeemfout aan het downloaden van https://ci.guix.gnu.org/nar/lzip/3j9kzhsygg56pmhlwpvjqicvjgsni49w-guix-1.3.0-3.50dfbbf... guix-1.3.0-3.50dfbbf 35.9MiB 246.2MiB/s 00:00 [############ ] 70.9% Backtrace: In guix/store.scm: 1319:8 19 (call-with-build-handler _ _) 1319:8 18 (call-with-build-handler # …) In guix/ui.scm: 463:3 17 (_) In ice-9/boot-9.scm: 1747:15 16 (with-exception-handler # …) 1752:10 15 (with-exception-handler _ _ #:unwind? _ # _) In guix/ui.scm: 450:6 14 (_) In guix/scripts/build.scm: 608:5 13 (_) In srfi/srfi-1.scm: 673:15 12 (append-map _ _ . _) 586:17 11 (map1 ("x86_64-linux")) In guix/scripts/build.scm: 610:20 10 (_ _) In guix/store.scm: 1376:5 9 (map/accumulate-builds # …) 1387:15 8 (_ # _ _) 759:13 7 (process-stderr _ _) In unknown file: 6 (display "@ substituter-succeeded /gnu/store/3j9kzhsyg…" …) In guix/status.scm: 722:16 5 (write! _ _ _) 636:6 4 (_ (download-progress "/gnu/store/3j9kzhsygg56pmhlw…" …) …) In guix/progress.scm: 223:17 3 (display-download-progress "ci.guix.gnu.o@" _ #:tty? _ # …) In ice-9/boot-9.scm: 1685:16 2 (raise-exception _ #:continuable? _) 1685:16 1 (raise-exception _ #:continuable? _) 1685:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1685:16: In procedure raise-exception: In procedure =: Wrong type argument in position 1: #f