From 95245d5a572034b617799bf1f124ae777061589f Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Sat, 6 Jul 2024 18:45:41 +0100
Subject: [PATCH] Fix crash opening landscape window when there are no
 available objects

See: #713
---
 src/newgrf_class_func.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/newgrf_class_func.h b/src/newgrf_class_func.h
index e4294b07d2..6142459dbc 100644
--- a/src/newgrf_class_func.h
+++ b/src/newgrf_class_func.h
@@ -120,8 +120,8 @@ uint NewGRFClass<Tspec, Tid, Tmax>::GetUIClassCount()
 template <typename Tspec, typename Tid, Tid Tmax>
 bool NewGRFClass<Tspec, Tid, Tmax>::HasUIClass()
 {
-	for (uint i = 0; i < Tmax && classes[i].global_id != 0; i++) {
-		if (classes[i].GetUISpecCount() > 0) return true;
+	for (const auto &cls : NewGRFClass::classes) {
+		if (cls.GetUISpecCount() > 0) return true;
 	}
 	return false;
 }