From b855903f99d5af1c9a0efb436c69fa13467498d0 Mon Sep 17 00:00:00 2001
From: "John \"Elwin\" Edwards" <elwin@rlgallery.org>
Date: Thu, 8 Feb 2018 20:54:34 -0500
Subject: [PATCH] UltraRogue: clear the next_obj field when removing items from
 the floor.

The next_obj field is a pointer which the top item in a stack uses to
keep a list of the other items.  When removing an item from the stack,
rem_obj() failed to set next_obj to NULL, which can cause items in
monster inventory to point to items earlier in the inventory list.
That causes infinite co-recursion when saving or restoring.
---
 urogue/things.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/urogue/things.c b/urogue/things.c
index a3e781a..dad1af0 100644
--- a/urogue/things.c
+++ b/urogue/things.c
@@ -292,6 +292,8 @@ rem_obj(struct linked_list *item, int dis)
 	if (op->next_obj)
             objptr->next_obj->l_prev = NULL;
 
+        objptr->next_obj = NULL;
+
         y = op->o_pos.y;
         x = op->o_pos.x;