From 9ea628b9128b53145101beb16ea6d525c67c648d Mon Sep 17 00:00:00 2001
From: danielpeintner <daniel.peintner@gmail.com>
Date: Mon, 25 Sep 2023 13:59:31 +0200
Subject: [PATCH] Update packages/core/src/consumed-thing.ts

Co-authored-by: Jan Romann <jan.romann@uni-bremen.de>
---
 packages/core/src/consumed-thing.ts | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/packages/core/src/consumed-thing.ts b/packages/core/src/consumed-thing.ts
index da88b7b58..8161dc188 100644
--- a/packages/core/src/consumed-thing.ts
+++ b/packages/core/src/consumed-thing.ts
@@ -169,9 +169,7 @@ class InternalPropertySubscription extends InternalSubscription {
         if (tp == null) {
             throw new Error(`ConsumedThing '${this.thing.title}' does not have property ${this.name}`);
         }
-        if (options.formIndex == null) {
-            options.formIndex = this.matchingUnsubscribeForm();
-        }
+        options.formIndex ??= this.matchingUnsubscribeForm();
         const { form } = this.thing.getClientFor(tp.forms, "unobserveproperty", Affordance.PropertyAffordance, options);
         if (form == null) {
             throw new Error(`ConsumedThing '${this.thing.title}' did not get suitable form`);