From 61c0eaa0b66e14f2d9d533613ebda54e1a3dec7c Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 30 Jun 2025 15:25:21 -0400
Subject: [PATCH] make non-optional

---
 packages/svelte/src/internal/client/runtime.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index c66ed05927..3e70537d7c 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -278,7 +278,7 @@ export function update_reaction(reaction) {
 	reaction.f |= EFFECT_IS_UPDATING;
 
 	if (reaction.ac !== null) {
-		reaction.ac?.abort(STALE_REACTION);
+		reaction.ac.abort(STALE_REACTION);
 		reaction.ac = null;
 	}