User list empty chat

[1-alex98]

Describe the bug
On startup chat user list stays empty

To Reproduce
Probably a race condition

Log or error message
This is my log file:

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
	at com.sun.javafx.collections.ObservableListWrapper.removeAll(ObservableListWrapper.java:173)
	at com.faforever.client.chat.ChannelTabController.lambda$onUserLeft$37(ChannelTabController.java:554)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run$$$capture(InvokeLaterDispatcher.java:96)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
	at java.base/java.lang.Thread.run(Thread.java:832)

Expected behavior
The chat controllers are loaded before these kind of events.

OS
Linux or Windows

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[Sheikah45]

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