From 24df8073acae66b0597585cb4f360f205c048299 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Mon, 13 Feb 2023 11:02:58 +0300
Subject: [PATCH] mdbx: fix extra assertion inside `override_meta()`
 (backport).

---
 src/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core.c b/src/core.c
index e72b4600..728dbbfd 100644
--- a/src/core.c
+++ b/src/core.c
@@ -12824,7 +12824,8 @@ __cold static int __must_check_result mdbx_override_meta(
   mdbx_meta_model(env, page, target);
   MDBX_meta *const model = page_meta(page);
   meta_set_txnid(env, model, txnid);
-  mdbx_assert(env, meta_checktxnid(env, model, true));
+  if (txnid)
+    mdbx_assert(env, meta_checktxnid(env, model, true));
   if (shape) {
     if (txnid && unlikely(!meta_checktxnid(env, shape, false))) {
       mdbx_error("bailout overriding meta-%u since model failed "