From ca847d02b04b5677c1a95e538dc30d1d92a6366a Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Fri, 18 Aug 2023 22:23:19 -0700
Subject: [PATCH] Fixed highest point in HNSW vacuum [skip ci]

---
 src/hnswvacuum.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/hnswvacuum.c b/src/hnswvacuum.c
index 9a16103..146c5c3 100644
--- a/src/hnswvacuum.c
+++ b/src/hnswvacuum.c
@@ -278,8 +278,11 @@ RepairGraphEntryPoint(HnswVacuumState * vacuumstate)
 	 * ideal.
 	 */
 
+	if (!BlockNumberIsValid(highestPoint->blkno))
+		highestPoint = NULL;
+
 	/* Repair graph for highest non-entry point */
-	if (BlockNumberIsValid(highestPoint->blkno))
+	if (highestPoint != NULL)
 	{
 		HnswLoadElement(highestPoint, NULL, NULL, index, vacuumstate->procinfo, vacuumstate->collation, true);
 		RepairGraphElement(vacuumstate, highestPoint);