From 3bd85d417ea862c67b17d884691c729b3ba1fb92 Mon Sep 17 00:00:00 2001
From: Ivan Savenko <saven.ivan@gmail.com>
Date: Wed, 13 Dec 2023 16:55:38 +0200
Subject: [PATCH] Avoid crash on invalid building identifier

---
 lib/mapObjectConstructors/CommonConstructors.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mapObjectConstructors/CommonConstructors.cpp b/lib/mapObjectConstructors/CommonConstructors.cpp
index 6a558b96a..f8670ce31 100644
--- a/lib/mapObjectConstructors/CommonConstructors.cpp
+++ b/lib/mapObjectConstructors/CommonConstructors.cpp
@@ -77,7 +77,7 @@ void CTownInstanceConstructor::afterLoadFinalization()
 	{
 		filters[entry.first] = LogicalExpression<BuildingID>(entry.second, [this](const JsonNode & node)
 		{
-			return BuildingID(VLC->identifiers()->getIdentifier("building." + faction->getJsonKey(), node.Vector()[0]).value());
+			return BuildingID(VLC->identifiers()->getIdentifier("building." + faction->getJsonKey(), node.Vector()[0]).value_or(-1));
 		});
 	}
 }