From 59f4865a0710032b1c102a17d9bce5e583ccbec0 Mon Sep 17 00:00:00 2001
From: Alexsandro Percy <alexsandro.percy@gmail.com>
Date: Thu, 24 Aug 2023 20:14:00 -0300
Subject: [PATCH] improved vehicle destruction code

---
 lib_planes/custom_physics.lua | 1 +
 lib_planes/entities.lua       | 5 +++++
 physics_lib.lua               | 2 ++
 3 files changed, 8 insertions(+)

diff --git a/lib_planes/custom_physics.lua b/lib_planes/custom_physics.lua
index 8e4a5f6..fba2bb3 100755
--- a/lib_planes/custom_physics.lua
+++ b/lib_planes/custom_physics.lua
@@ -7,6 +7,7 @@ function airutils.physics(self)
 	local surface = nil
 	local surfnodename = nil
 	local spos = airutils.get_stand_pos(self)
+    if not spos then return end
 	spos.y = spos.y+0.01
 	-- get surface height
 	local snodepos = airutils.get_node_pos(spos)
diff --git a/lib_planes/entities.lua b/lib_planes/entities.lua
index ca49604..2119e81 100644
--- a/lib_planes/entities.lua
+++ b/lib_planes/entities.lua
@@ -119,6 +119,10 @@ function airutils.on_step(self,dtime,colinfo)
 	    end
     end
     
+    if self.hp_max <= 0 then
+        airutils.destroy(self)
+    end
+
     self:physics()
 
     if self.logic then
@@ -214,6 +218,7 @@ function airutils.logic(self)
         end
     end
 
+    if not self.object:get_acceleration() then return end
     local accel_y = self.object:get_acceleration().y
     local rotation = self.object:get_rotation()
     local yaw = rotation.y
diff --git a/physics_lib.lua b/physics_lib.lua
index d6702f5..3f58943 100755
--- a/physics_lib.lua
+++ b/physics_lib.lua
@@ -42,9 +42,11 @@ function airutils.get_stand_pos(thing)	-- thing can be luaentity or objectref.
 	local colbox = {}
 	if type(thing) == 'table' then
 		pos = thing.object:get_pos()
+        if not thing.object:get_properties() then return false end
 		colbox = thing.object:get_properties().collisionbox
 	elseif type(thing) == 'userdata' then
 		pos = thing:get_pos()
+        if not thing:get_properties() then return false end
 		colbox = thing:get_properties().collisionbox
 	else 
 		return false