Event vk api not working?

Question

JavaScript

There is a code, if the name of the conversation changes, then a check is performed: whether the user is an administrator or not. And it gives me an error: " Handle polling update error: TypeError: Cannot read properties of undefined (reading 'role') "
Code:

vk.updates.on(['chat_title_update'], (next, context) => {
  const peer = chats.filter(x => x.id === next.chatId)[0];
  const user = peer.members.filter(x => x.id === next.eventMemberId)[0];
        if(user.role==0){
           vk.api.messages.removeChatUser({ chat_id: next.chatId, user_id: user.id });
           vk.api.messages.editChat({ chat_id: next.chatId, title: peer.name });
        }
        return context();
});

JSON excerpt:
[
{
"id": 1,
"cid": 0,
"name": "test",
"owner": 0,
"greeting": "Not set",
"members": [
{
"id" : 0,
"ban": false,
"points": 0,
"warn": 0,
"mute": 0,
"role": 4
},
{
"id": 1,
"ban": false,
"points" : 0,
"warn": 0,
"mute": 0,
"role":0
}
]
}
]

Answer 1

The problem was that this event does not send 'eventMemberId', it sends 'senderId'.

Answer 2

print the next object to the console and see what the exact parameters are, there may also be an error due to the fact that the user is simply not found in the database and returns undefined