From 383da335d8019cc908a8e9f24089dd6dd4da22a2 Mon Sep 17 00:00:00 2001
From: Greyson Parrelli <greyson@signal.org>
Date: Thu, 10 Apr 2025 10:16:44 -0400
Subject: [PATCH] Do not send sync messages if we have no linked devices.

---
 .../signalservice/api/SignalServiceMessageSender.java        | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/SignalServiceMessageSender.java b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/SignalServiceMessageSender.java
index be4ac0ad38..3c9282c0af 100644
--- a/libsignal-service/src/main/java/org/whispersystems/signalservice/api/SignalServiceMessageSender.java
+++ b/libsignal-service/src/main/java/org/whispersystems/signalservice/api/SignalServiceMessageSender.java
@@ -705,6 +705,11 @@ public class SignalServiceMessageSender {
     Content content;
     boolean urgent = false;
 
+    if (!aciStore.isMultiDevice()) {
+      Log.w(TAG, "We do not have any linked devices. Skipping.");
+      return SendMessageResult.success(localAddress, Collections.emptyList(), false, false, 0, Optional.empty());
+    }
+
     if (message.getContacts().isPresent()) {
       content = createMultiDeviceContactsContent(message.getContacts().get().getContactsStream().asStream(), message.getContacts().get().isComplete());
     } else if (message.getRead().isPresent()) {