From 0be07d2816a5be9918525b85853c59b91a308bd2 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Wed, 29 Apr 2026 15:45:12 +0300
Subject: [PATCH] Fix migrating object trying to newsym invalid location

---
 src/teleport.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/teleport.c b/src/teleport.c
index 48fa7da78..3384fa204 100644
--- a/src/teleport.c
+++ b/src/teleport.c
@@ -2139,9 +2139,10 @@ rloco(struct obj *obj)
                                            svd.dndest.nhx, svd.dndest.nhy)));
 
     if (flooreffects(obj, tx, ty, "fall")) {
-        /* update old location since flooreffects() couldn't;
+        /* update old location (if any) since flooreffects() couldn't;
            unblock_point() for boulder handled by obj_extract_self() */
-        newsym(otx, oty);
+        if (!(otx == 0 && oty == 0))
+            newsym(otx, oty);
         return FALSE;
     } else if (otx == 0 && oty == 0) {
         ; /* fell through a trap door; no update of old loc needed */