java.lang.ArrayIndexOutOfBoundsException: -1
	at cn.nukkit.level.format.generic.BaseFullChunk.setHeightMap(BaseFullChunk.java:232)
	at cn.nukkit.level.format.generic.BaseFullChunk.recalculateHeightMapColumn(BaseFullChunk.java:254)
	at cn.nukkit.level.format.generic.BaseFullChunk.recalculateHeightMap(BaseFullChunk.java:239)
	at cn.nukkit.level.generator.task.PopulationTask.generationTask(PopulationTask.java:114)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:48)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.syncGen(PopulationTask.java:53)
	at cn.nukkit.level.generator.task.PopulationTask.onRun(PopulationTask.java:43)
	at cn.nukkit.scheduler.AsyncTask.run(AsyncTask.java:23)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)