Gui Client crashes with NullPointerException

[asciijungle]

I've encountered a bug which leads to an application crash.

Fri Apr 06 17:39:45 CEST 2018 ERROR:null
java.lang.NullPointerException
	at iteratec.guiclient.traze.TrazeGUIClient.render(TrazeGUIClient.java:40)
	at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:688)
	at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
	at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
	at iteratec.guiclient.traze.TrazeGUIClient.startClient(TrazeGUIClient.java:30)
	at iteratec.guiclient.traze.TrazeClient.main(TrazeClient.java:28)
Fri Apr 06 17:39:45 CEST 2018 ERROR:Game.render() failure - check the game code.
org.newdawn.slick.SlickException: Game.render() failure - check the game code.
	at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:691)
	at org.newdawn.slick.AppGameContainer.gameLoop(AppGameContainer.java:411)
	at org.newdawn.slick.AppGameContainer.start(AppGameContainer.java:321)
	at iteratec.guiclient.traze.TrazeGUIClient.startClient(TrazeGUIClient.java:30)
	at iteratec.guiclient.traze.TrazeClient.main(TrazeClient.java:28)
java -Djava.library.path=$(pwd)/native/linux -jar   43.41s user 3.67s system 26% cpu 2:54.87 total

[raLaaaa]

Unfortunately it was not possible for me to reproduce the issue, however there is an assumption what could lead to the application crash. Could you confirm whether the issue was fixed?