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-rw-r--r--guix/scripts/package.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index b6133b6af0..fa45bd48a6 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -486,7 +486,7 @@ Install, remove, or upgrade packages in a single transaction.\n"))
arg-handler))))
(option '(#\u "upgrade") #f #t
(lambda (opt name arg result arg-handler)
- (when (string-prefix? "-" arg)
+ (when (and arg (string-prefix? "-" arg))
(warning (G_ "upgrade regexp '~a' looks like a \
command-line option~%")
arg)