From 036577402d022a9b1542f6c2e92a57b7d36cc3d4 Mon Sep 17 00:00:00 2001
From: toaster <rollerorbital@gmail.com>
Date: Mon, 18 Sep 2023 10:22:20 +0100
Subject: [PATCH] Change Scroller Direction (linedef 435): Do not crash on
 Tag_Find for sidedef scrollers

---
 src/p_spec.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/p_spec.c b/src/p_spec.c
index d6fcd3f82..79cb28377 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -3234,7 +3234,12 @@ boolean P_ProcessSpecial(activator_t *activator, INT16 special, INT32 *args, cha
 						continue;
 
 					scroller = (scroll_t *)th;
-					if (!Tag_Find(&sectors[scroller->affectee].tags, args[0]))
+
+					const taglist_t* taglist = (scroller->type == sc_side)
+						? &sides[scroller->affectee].line->tags
+						: &sectors[scroller->affectee].tags;
+
+					if (!Tag_Find(taglist, args[0]))
 						continue;
 
 					switch (scroller->type)