From e764d2c76d0c2b3584a11c9b2b74f0172c4f6209 Mon Sep 17 00:00:00 2001
From: Kris Zyp <kriszyp@gmail.com>
Date: Tue, 21 Jan 2025 10:01:19 -0700
Subject: [PATCH] Try to recover from closing a freed cursor

---
 dependencies/lmdb/libraries/liblmdb/mdb.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dependencies/lmdb/libraries/liblmdb/mdb.c b/dependencies/lmdb/libraries/liblmdb/mdb.c
index e33158092..113c6ce98 100644
--- a/dependencies/lmdb/libraries/liblmdb/mdb.c
+++ b/dependencies/lmdb/libraries/liblmdb/mdb.c
@@ -10357,6 +10357,11 @@ void
 mdb_cursor_close(MDB_cursor *mc)
 {
 	if (mc) {
+		if (!mc->mc_txn || !mc->mc_txn->mt_env) {
+	        fprintf(stderr, "cursor_close: mc->mc_txn or mc->mc_txn->mt_env is NULL, ensure that cursors are closed before the transaction is closed\n");
+			free(mc);
+			return;
+        }
 		MDB_CURSOR_UNREF(mc, 0);
 	}
 	if (mc && !mc->mc_backup) {