From 79cee7e08fe44f96271e7b0062704690fc5c9ef3 Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Sat, 20 Oct 2007 17:11:02 +0000
Subject: [PATCH] (svn r11314) -Fix [FS#1356]: stop following a vehicle when
 you sell/destroyed it.

---
 src/vehicle.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 21c8996f18..28fb0e64cc 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -529,6 +529,14 @@ void Vehicle::PreDestructor()
 	if ((this->type == VEH_TRAIN && EngineHasArticPart(this)) || (this->type == VEH_ROAD && RoadVehHasArticPart(this))) {
 		delete this->Next();
 	}
+
+	Window **wp;
+	FOR_ALL_WINDOWS(wp) {
+		Window *w = *wp;
+		if (w->viewport != NULL && WP(w, vp_d).follow_vehicle == this->index) {
+			WP(w, vp_d).follow_vehicle = INVALID_VEHICLE;
+		}
+	}
 }
 
 Vehicle::~Vehicle()