From 9564156b2f48c241dd1c476ae255c320e2bf8ed8 Mon Sep 17 00:00:00 2001
From: LeMagnesium <mg.minetest@gmail.com>
Date: Sat, 17 Jan 2015 00:51:52 +0100
Subject: [PATCH] Added security in carts about driver's yaw calculation -
 Thanks to @crabman77 for having reported the issue

---
 mods/carts/init.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mods/carts/init.lua b/mods/carts/init.lua
index acea8fc4..722325b7 100755
--- a/mods/carts/init.lua
+++ b/mods/carts/init.lua
@@ -543,6 +543,9 @@ function cart:on_step(dtime)
       self.yawtarget=newyaw  -- Set new target.
       -- minetest.log("action", "--Cart yawtarget set "..self.yawtarget)
     end
+    if self.driver:get_look_yaw() == nil then
+        return
+    end
     local playeryaw=self.driver:get_look_yaw()-1.57
     if playeryaw<0 then playeryaw=playeryaw+(math.pi*2) end
     if self.yawtarget and playeryaw ~= self.yawtarget  then