diff --git a/src/common/backend/utils/hash/dynahash.cpp b/src/common/backend/utils/hash/dynahash.cpp
index b8fb6eeb3..72bde47f7 100644
--- a/src/common/backend/utils/hash/dynahash.cpp
+++ b/src/common/backend/utils/hash/dynahash.cpp
@@ -1094,7 +1094,7 @@ void hash_seq_init(HASH_SEQ_STATUS* status, HTAB* hashp)
     status->hashp = hashp;
     status->curBucket = 0;
     status->curEntry = NULL;
-    if (!hashp->frozen) {
+    if (hashp != NULL && !hashp->frozen) {
         register_seq_scan(hashp);
     }
 }