Hoping it might be useful for debugging, as the programme already seems quite robust and reliable (I had only 3 or 4 crashes in almost 300 hours of play time): this NPE just occurred while in multi-player (server DAY [ONE], if it is relevant, which I doubt).
Error message pasted below; errorlog and info (renamed) attached.
Linux 3.13.0-24-generic Java: 1.8.0_91 amd64 0.7.0.2_28 -H:1536-DMemDirect=1024-XX:MaxDirectMemorySize=1024m -D:null (Steam)
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Error occurred during application-update (11)
java.lang.NullPointerException
at U.z.run(SourceFile:143)
at commons.JIWApplication.update(SourceFile:113)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:152)
at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:192)
at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:233)
at java.lang.Thread.run(Thread.java:745)