From a4dc340bbc41ef93f959fa67b8a787b04ca6e4f4 Mon Sep 17 00:00:00 2001
From: Alan Evans <alan@signal.org>
Date: Thu, 9 Jul 2020 14:49:46 -0300
Subject: [PATCH] Handle empty group change byte array.

---
 .../signalservice/api/messages/SignalServiceContent.java        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/SignalServiceContent.java b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/SignalServiceContent.java
index 453a1d9e3..76783f96f 100644
--- a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/SignalServiceContent.java
+++ b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/messages/SignalServiceContent.java
@@ -930,7 +930,7 @@ public final class SignalServiceContent {
       throw new ProtocolInvalidMessageException(new InvalidMessageException(e), null, 0);
     }
 
-    if (groupV2.hasGroupChange()) {
+    if (groupV2.hasGroupChange() && !groupV2.getGroupChange().isEmpty()) {
       builder.withSignedGroupChange(groupV2.getGroupChange().toByteArray());
     }