From 33486d71b1714986dd04dae4e7a222c401addb2e Mon Sep 17 00:00:00 2001
From: Robert Escriva <robert@trychroma.com>
Date: Thu, 2 Jan 2025 08:51:26 -0800
Subject: [PATCH] [BUG]  Fix an off-by-one.

When changing from assertions to exceptions we introduced a change in
behavior.

```
    assert(data[j] > 0);
```

became

```
    if (data[j] < 0 || ...)
```

This matches the changes before Monday to check <= 0.
---
 hnswlib/hnswalg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hnswlib/hnswalg.h b/hnswlib/hnswalg.h
index e4e8150f..37efc905 100644
--- a/hnswlib/hnswalg.h
+++ b/hnswlib/hnswalg.h
@@ -1835,7 +1835,7 @@ namespace hnswlib
                     std::unordered_set<tableint> s;
                     for (int j = 0; j < size; j++)
                     {
-                        if (data[j] < 0 || data[j] >= cur_element_count || data[j] == i)
+                        if (data[j] <= 0 || data[j] >= cur_element_count || data[j] == i)
                             throw std::runtime_error("HNSW Integrity failure: invalid neighbor index");
                         inbound_connections_num[data[j]]++;
                         s.insert(data[j]);