Jitsi would crash if it tried to call retrieveParticipantsInfo when it quit and rejoined

### Steps to reproduce

When Jitsi is minimized, click the leave button of the chat room, and when you rejoin, if you call retrieveParticipantsInfo while joining a multiplayer video, you'll see a crash in that video
当Jitsi最小化时，点击聊天室的离开按钮，当重新加入时，如果在加入多人视频时调用了retrieveParticipantsInfo 会出现该视频中的崩溃情况

https://github.com/user-attachments/assets/757ee616-c289-4eb9-be50-bd730bd152b5

### Outcome

retrieveParticipantsInfo can be used normally to obtain the currently participating video personnel and solve the flash and retreat situation
能够正常使用retrieveParticipantsInfo去获取到当前参与的视频人员，解决闪退情况

### Your phone model

各类型的手机型号

### Operating system version

iOS 16

### Application version

0.27.6

### Homeserver

_No response_

### Will you send logs?

Yes

Start by reproducing the minimized-chat-room leave and rejoin flow on iOS 16 with Element 0.27.6, then trace retrieveParticipantsInfo while joining a multiplayer video. Done means retrieveParticipantsInfo returns the current participants without a crash or video exit.

Written by the indexing model from the issue text.