From d75415ccfd5277d27c222ddb27608c1acccaedac Mon Sep 17 00:00:00 2001
From: Hope Casey-Allen <hcaseyal@google.com>
Date: Thu, 6 Sep 2018 14:24:59 -0700
Subject: [PATCH] Fix assertion in debugging code

---
 src/core/lib/transport/metadata_batch.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/lib/transport/metadata_batch.cc b/src/core/lib/transport/metadata_batch.cc
index 304a5d510d8..788681f006c 100644
--- a/src/core/lib/transport/metadata_batch.cc
+++ b/src/core/lib/transport/metadata_batch.cc
@@ -134,7 +134,7 @@ static void assert_valid_list(grpc_mdelem_list* list) {
 
   size_t verified_count = 0;
   for (l = list->head; l; l = l->next) {
-    GPR_ASSERT(!GRPC_MDISNULL(l->md));
+    GPR_ASSERT(is_mdelem_index_used(l->md_index) || !GRPC_MDISNULL(l->md));
     GPR_ASSERT((l->prev == nullptr) == (l == list->head));
     GPR_ASSERT((l->next == nullptr) == (l == list->tail));
     if (l->next) GPR_ASSERT(l->next->prev == l);