Fix support for --update=swapsuper

The user of dup_super broke it.

1 files changed, 2 insertions, 1 deletions

diff --git a/util.c b/util.c
index 1ad6fd0..6efb88a 100644
--- a/util.c
+++ b/util.c
@@ -781,7 +781,8 @@ struct supertype *dup_super(struct supertype *st)
 	for (i = 0; stnew == NULL && superlist[i] ; i++)
 		stnew = superlist[i]->match_metadata_desc(verstr);
 
-	stnew->sb = NULL;
+	if (stnew)
+		stnew->sb = NULL;
 	return stnew;
 }