From a4bafa18ddccdbe86f8d7cd2ea8fcbce7db48c72 Mon Sep 17 00:00:00 2001
From: MrMelbert <51863163+MrMelbert@users.noreply.github.com>
Date: Tue, 7 Apr 2026 19:55:20 -0500
Subject: [PATCH] Block edits on cached movespeed modifiers (#95617)

---
 code/modules/movespeed/_movespeed_modifier.dm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/code/modules/movespeed/_movespeed_modifier.dm b/code/modules/movespeed/_movespeed_modifier.dm
index fea932650f6..af4b29d89d6 100644
--- a/code/modules/movespeed/_movespeed_modifier.dm
+++ b/code/modules/movespeed/_movespeed_modifier.dm
@@ -53,6 +53,12 @@ Key procs
 	if(!id)
 		id = "[type]" //We turn the path into a string.
 
+/datum/movespeed_modifier/vv_edit_var(var_name, var_value)
+	if(GLOB.movespeed_modification_cache[type] == src)
+		return FALSE
+
+	return ..()
+
 GLOBAL_LIST_EMPTY(movespeed_modification_cache)
 
 /// Grabs a STATIC MODIFIER datum from cache. YOU MUST NEVER EDIT THESE DATUMS, OR IT WILL AFFECT ANYTHING ELSE USING IT TOO!