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-rw-r--r--refs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/refs.c b/refs.c
index b9cf284f31..d5bfd11790 100644
--- a/refs.c
+++ b/refs.c
@@ -3702,6 +3702,8 @@ int ref_transaction_delete(struct ref_transaction *transaction,
unsigned int flags, const char *msg,
struct strbuf *err)
{
+ if (old_sha1 && is_null_sha1(old_sha1))
+ die("BUG: delete called with old_sha1 set to zeros");
return ref_transaction_update(transaction, refname,
null_sha1, old_sha1,
flags, msg, err);