From cb8ed6722a3c52692e708d3b9bde5ccf99e5d4ac Mon Sep 17 00:00:00 2001
From: fox0430 <shuu.n@protonmail.com>
Date: Mon, 13 Apr 2026 16:32:18 +0900
Subject: [PATCH] Add bounds check to isNull

---
 async_postgres/pg_types.nim | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/async_postgres/pg_types.nim b/async_postgres/pg_types.nim
index 72dbd78..08635da 100644
--- a/async_postgres/pg_types.nim
+++ b/async_postgres/pg_types.nim
@@ -1620,6 +1620,10 @@ proc contains*(cr: CommandResult, s: string): bool {.inline.} =
 
 proc isNull*(row: Row, col: int): bool =
   ## Check if the column value is NULL.
+  if col < 0 or col >= int(row.data.numCols):
+    raise newException(
+      IndexDefect, "column index " & $col & " out of range 0..<" & $row.data.numCols
+    )
   let idx = (int(row.rowIdx) * int(row.data.numCols) + col) * 2
   row.data.cellIndex[idx + 1] == -1'i32