java.lang.NullPointerException
	at fr.elias.basicsidescroller.common.world.World.solidTile(World.java:97)
	at fr.elias.basicsidescroller.common.world.World.render(World.java:30)
	at fr.elias.basicsidescroller.common.states.GameState.render(GameState.java:24)
	at org.newdawn.slick.state.StateBasedGame.render(StateBasedGame.java:199)
	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 fr.elias.basicsidescroller.common.BasicSideScroller.main(BasicSideScroller.java:48)
Sat Oct 10 21:49:43 CEST 2015 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 fr.elias.basicsidescroller.common.BasicSideScroller.main(BasicSideScroller.java:48)