Player list is not reset after quiting singleplayer mode and running again

[thanhpd]

!!!   Hi Welcome to Risk Game   !!!

!!!  Enter mode   !!!

!!!  Enter tournament or singleplayer   !!!

Please enter a command:
singleplayer
Command entered is: singleplayer

You are in the PRELOAD PHASE. Commands available are: [loadgame, loadmap]

Please enter a command:
loadmap src/main/resources/maps/europe.map
Command entered is: loadmap src/main/resources/maps/europe.map
Loading Map: europe.map
Map is valid

You are in the POSTLOAD PHASE. Commands available are: [showmap, next, editneighbor, editcountry, savemap, editmap, validatemap, editcontinent]

Please enter a command:
next
Command entered is: next
Map is valid

You are in the PLAYSETUP PHASE. Commands available are: [gameplayer, assigncountries]

Please enter a command:
gameplayer -add player1 Human -add player2 Cheater
Command entered is: gameplayer -add player1 Human -add player2 Cheater

===========
Running the -add option with the parameters [player1, Human].

Created Player: player1

===========
Running the -add option with the parameters [player2, Cheater].

Created Player: player2

Please enter a command:
quit
Command entered is: quit

!!!   Hi Welcome to Risk Game   !!!

!!!  Enter mode   !!!

!!!  Enter tournament or singleplayer   !!!

Please enter a command:
singleplayer
Command entered is: singleplayer

You are in the PRELOAD PHASE. Commands available are: [loadgame, loadmap]
Please enter a command:
loadmap src/main/resources/maps/europe.map
Command entered is: loadmap src/main/resources/maps/europe.map
Loading Map: europe.map
Map is valid

You are in the POSTLOAD PHASE. Commands available are: [showmap, next, editneighbor, editcountry, savemap, editmap, validatemap, editcontinent]

Please enter a command:
next
Command entered is: next
Map is valid

You are in the PLAYSETUP PHASE. Commands available are: [gameplayer, assigncountries]

Please enter a command:
gameplayer -add player1 Human -add player2 Cheater
Command entered is: gameplayer -add player1 Human -add player2 Cheater

===========
Running the -add option with the parameters [player1, Human].

Player already exists!

===========
Running the -add option with the parameters [player2, Cheater].

Player already exists!

Please enter a command: