From e679b6ae7e2a841ee72685601d63dc5e4349e2be Mon Sep 17 00:00:00 2001
From: Alexander Zinchuk <alx.zinchuk@gmail.com>
Date: Sat, 5 Mar 2022 18:06:15 +0100
Subject: [PATCH] Management / Add Member: Fix exception

---
 src/modules/actions/api/chats.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/modules/actions/api/chats.ts b/src/modules/actions/api/chats.ts
index 170e58ea2..392dd28a0 100644
--- a/src/modules/actions/api/chats.ts
+++ b/src/modules/actions/api/chats.ts
@@ -953,12 +953,16 @@ addReducer('loadMoreMembers', (global) => {
 
     global = getGlobal();
     global = addUsers(global, buildCollectionByKey(users, 'id'));
+
+    const newMemberIds = new Set(members.map(m => m.userId));
+    const preservedMembers = chat.fullInfo?.members?.filter((m) => !newMemberIds.has(m.userId)) || [];
+
     global = updateChat(global, chat.id, {
       fullInfo: {
         ...chat.fullInfo,
         members: [
-          ...((chat.fullInfo || {}).members || []),
-          ...(members || []),
+          ...preservedMembers,
+          ...members,
         ],
       },
     });