DesktopPlayer Close event triggered for an already close DesktopPlayer

[3do2]

While i was woking on my HTML5 project i noticed that a close event is sent to all already closed players.
I've add a trace into the BigBrother source and i notice the same behaviour.
Is it normal ? If Player is closed (left the game), it should be deleted from memory ?

02:08:05 [INFO] Preparing level "world"
02:08:05 [INFO] Enabling WorldEditArt v1.0.0_beta_dev_#045
02:08:05 [INFO] Starting GS4 status listener
02:08:05 [INFO] Setting query port to 19132
02:08:05 [INFO] Query running on 0.0.0.0:19132
02:08:05 [INFO] Default game type: SURVIVAL
02:08:05 [INFO] Done (0.919s)! For help, type "help" or "?"
02:08:20 [INFO] [BigBrother] Starting Minecraft: PC server on :25565 version 1.8
02:09:37 [INFO] bifag[/127.0.0.1:54436] logged in with entity id 1 at (world, 134.9208, 4, 121.7399)
02:09:37 [INFO] bifag joined the game
*[BigBrother] DesktopPlayer : close**
02:09:40 [INFO] bifag has left the game
02:09:40 [INFO] bifag[/127.0.0.1:54436] logged out due to Connection closed
stop
02:09:51 [INFO] CONSOLE: Stopping the server...
[BigBrother] DesktopPlayer : close
02:09:51 [INFO] Disabling DevTools v1.9.0
02:09:51 [INFO] Disabling WorldEditArt v1.0.0_beta_dev_#045
02:09:51 [INFO] Disabling Bag_client v0.1.1-alpha
ProtocalInterface::shutdown
[bag_client] <------ 00000000000000{"pid":"close","reason":"Server Shutdown"}
02:09:51 [INFO] Disabling BigBrother v1.4.0-beta
02:09:52 [INFO] Unloading level "world"
02:09:52 [INFO] Stopping other threads
bin\php\php.exe: Segmentation fault