From 5dcdb5a75a970d354c34cd91e94dcbd554bcd72e Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Sun, 26 May 2024 10:52:04 -0400
Subject: [PATCH] Restored checks [skip ci]

---
 src/hnswutils.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/hnswutils.c b/src/hnswutils.c
index f78608b..d3ba911 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -806,9 +806,16 @@ HnswSearchLayer(char *base, Datum q, List *ep, int ef, int lc, Relation index, F
 
 				if (eDistance < f->distance || wlen < ef)
 				{
-					/* Copy e */
-					HnswCandidate *ec = palloc(sizeof(HnswCandidate));
+					HnswCandidate *ec;
 
+					Assert(!eElement->deleted);
+
+					/* Make robust to issues */
+					if (eElement->level < lc)
+						continue;
+
+					/* Copy e */
+					ec = palloc(sizeof(HnswCandidate));
 					HnswPtrStore(base, ec->element, eElement);
 					ec->distance = eDistance;