From 8aa8908e1881e5ffaff2dc256e135b7b743ed607 Mon Sep 17 00:00:00 2001
From: Kris Zyp <kriszyp@gmail.com>
Date: Mon, 10 Feb 2025 23:04:37 -0700
Subject: [PATCH] Throw if the db is closed

---
 package.json | 2 +-
 read.js      | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/package.json b/package.json
index df74aa3f6..05c556c19 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "lmdb",
   "author": "Kris Zyp",
-  "version": "3.2.5",
+  "version": "3.2.6",
   "description": "Simple, efficient, scalable, high-performance LMDB interface",
   "license": "MIT",
   "repository": {
diff --git a/read.js b/read.js
index 0587d5501..096347c40 100644
--- a/read.js
+++ b/read.js
@@ -416,6 +416,7 @@ export function addReadMethods(
 		},
 
 		attemptLock(id, version, callback) {
+			if (!env.address) throw new Error('Can not operate on a closed database');
 			keyBytes.dataView.setUint32(0, this.db.dbi);
 			keyBytes.dataView.setFloat64(4, version);
 			let keySize = this.writeKey(id, keyBytes, 12);
@@ -423,6 +424,7 @@ export function addReadMethods(
 		},
 
 		unlock(id, version, onlyCheck) {
+			if (!env.address) throw new Error('Can not operate on a closed database');
 			keyBytes.dataView.setUint32(0, this.db.dbi);
 			keyBytes.dataView.setFloat64(4, version);
 			let keySize = this.writeKey(id, keyBytes, 12);