diff --git a/packages/svelte/src/internal/client/dom/blocks/boundary.js b/packages/svelte/src/internal/client/dom/blocks/boundary.js
index b601955c52..bd82727629 100644
--- a/packages/svelte/src/internal/client/dom/blocks/boundary.js
+++ b/packages/svelte/src/internal/client/dom/blocks/boundary.js
@@ -312,7 +312,7 @@ export function suspend() {
 
 	return function unsuspend() {
 		// @ts-ignore
-		boundary?.fn(ASYNC_DECREMENT);
+		boundary?.fn?.(ASYNC_DECREMENT);
 	};
 }