1 files changed, 2 insertions, 1 deletions

diff --git a/util.c b/util.c
index 108f3c1..1ad6fd0 100644
--- a/util.c
+++ b/util.c
@@ -757,7 +757,8 @@ struct supertype *super_by_fd(int fd)
 
 	if (sra)
 		sysfs_free(sra);
-	st->sb = NULL;
+	if (st)
+		st->sb = NULL;
 	return st;
 }