From b95602a328c7b28b760b5d2920375f5ab83ab892 Mon Sep 17 00:00:00 2001
From: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>
Date: Mon, 13 Mar 2023 13:29:42 +0100
Subject: [PATCH] add check for an ancient issue with missing `to` field

---
 migrate.lua | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/migrate.lua b/migrate.lua
index 7df1157..3dc33c7 100644
--- a/migrate.lua
+++ b/migrate.lua
@@ -66,7 +66,8 @@ function mail.migrate_messages_v2_to_v3()
 						break
 					end
 				end
-				if new_msg then
+				-- add if valid and "to" field populated (missing in ancient storage formats)
+				if new_msg and msg.to then
 					local msg_table = {
 						sender  = msg.sender,
 						to      = msg.to,