Maps created with the mapeditor cant be loaded (r64)

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Because of not beeing able to open a map i created one myself with the Editor 
and once i tried to open it (game.engine.debug) it crashed

(Exception in thread "Thread-2" java.lang.NullPointerException
        at engine.game.objects.WorldTile.<init>(WorldTile.java:23)
        at engine.game.gameMain.loadLevel(gameMain.java:521)
        at engine.game.gameMain.initialize(gameMain.java:162)
        at engine.game.gameMain.run(gameMain.java:203)
        at java.lang.Thread.run(Thread.java:662))

Original issue reported on code.google.com by bastian....@googlemail.com on 22 Jan 2011 at 10:47