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-rw-r--r--src/linux/err.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/linux/err.c b/src/linux/err.c
index abc26806..c291136d 100644
--- a/src/linux/err.c
+++ b/src/linux/err.c
@@ -5,13 +5,13 @@
 
 void vwarn(const char *fmt, va_list ap)
 {
-	vfprintf(stderr, fmt, ap);
+	if (fmt) vfprintf(stderr, fmt, ap);
 	perror("");
 }
 
 void vwarnx(const char *fmt, va_list ap)
 {
-	vfprintf(stderr, fmt, ap);
+	if (fmt) vfprintf(stderr, fmt, ap);
 	putc('\n', stderr);
 }