1 files changed, 5 insertions, 1 deletions
diff --git a/guix/ui.scm b/guix/ui.scm
index 7d6ab9a2a7..76f6fc8eed 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -1484,7 +1484,11 @@ DURATION-RELATION with the current time."
         ((string->duration str)
          =>
          filter-by-duration)
-        (else #f)))
+        (else
+         (raise
+          (condition (&message
+                      (message (format #f (G_ "invalid syntax: ~a~%")
+                                       str))))))))
 
 (define (display-generation profile number)
   "Display a one-line summary of generation NUMBER of PROFILE."