Cannot connect to specific multiplayer server

I can play on any other server except 518Mafia. If I try to log onto that server, it automatically closes the game completely. Below is the error log.

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Report of 07.01.2015 by Ivansky
OS: Windows 8.1 (x64) Version: 6.3 Java version: 1.8.0_25 JVM architecture: amd64
CPU: [AuthenticAMD, AMD FX(tm)-8320 Eight-Core Processor, 4, 8] Executor poolsize: 1
Memory used: 109.90 MB reserved: 282.14 MB max: 2077.75 MB

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Existing buffers: 5124
(b: 2460 f: 1826 i: 7 s: 831 d: 0)
Total heap memory held: 107326kb
Total direct memory held: 341783kb
(b: 340706kb f: 970kb i: 0kb s: 105kb d: 0kb)

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Settings:
Resolution: 1280x720 (Windowed)
Frequency: 60 Vsync: off
DepthBits: 16
BitsPerPixel: 24
Samples: 1
MaxFrames: 200
Renderer: LWJGL-OpenGL2

Anisotropic: 0
DynamicLights: 100 Quality: 2
ViewDistance: 5 (LOD: 10)

LS(Q)/LG/ENV/PHD/NM/FOD/FXAA/SPEC/REFR/SSAO: 0(60)/0/0/0/1/0/0/0/0/0/

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Graphics: AMD Radeon HD 7700 Series Vendor: ATI Technologies Inc. OpenGL version: 4.3.12618 Compatibility Profile Context 13.251.0.0
Accelerated Memory: Indeterminate
GLMaxTextureSize: 16384
GLMaxTextureImageUnits: 32
GLMaxArrayTextureLayers: 35071
GLMaxVertexTextureImageUnits: 32
GLMaxVertexUniforms: 1024
GLMaxFragmentUniforms: 1024
GLMaxVaryingFloats: 128
GLMaxVertexAttribs: 29

Capabilities: [FrameBuffer, FrameBufferMRT, FrameBufferMultisample, TextureMultisample, OpenGL20, OpenGL21, OpenGL30, OpenGL31, OpenGL32, ARBprogram, GLSL100, GLSL110, GLSL120, GLSL130, GLSL140, GLSL150, VertexTextureFetch, TextureArray, TextureBuffer, FloatTexture, FloatColorBuffer, FloatDepthBuffer, PackedFloatTexture, SharedExponentTexture, PackedFloatColorBuffer, TextureCompressionLATC, NonPowerOfTwoTextures, MeshInstancing, VertexBufferArray, Multisample, PackedDepthStencilBuffer]

/////////////////////////////////////////////////////////////////////////////////
Camera location: (-2082.2417, 71.429276, -253.57083) Camera rotation: (0.044640932, -0.9552042, 0.1978862, 0.21548349)
Total running time: 22.695219

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C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/risingworld.jar (4cb2c6518c4ba0d6dc83e889392ad99a)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-core.jar (b6792c3064904122164b90736b32aa17)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-desktop.jar (246621cdca2d221115c5b6bc4cd08778)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-effects.jar (262315e2a17303144a1352adec7d559f)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-jbullet.jar (8b1c8d17234be9bd0296cff9fc6cf960)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jinput.jar (f445e38d170120a617de32302b7d05fc)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jbullet.jar (70b89e65d22ee46995fdd62d66b0d42c)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-jogg.jar (cd9933c09d97c029ce1031f7710482f8)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-lwjgl.jar (6e16a1baad94aaea17c6eac3b68f9fdc)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-lwjgl-natives.jar (c46724e849e2beb9ec600afe52163204)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-networking.jar (a7625269921502e6da6e4c06137101ac)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-plugins.jar (f7dc63bbb6a99a762cd083803c246f0a)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/jME3-terrain.jar (bc3922c21827f5a7217769f266cdfef7)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/j-ogg-oggd.jar (ccfb084cd5433e2939bb518867e99217)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/j-ogg-vorbisd.jar (cc32a32654b26d735f2a187d54186429)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/lwjgl.jar (ad9772c27b55296c1458b8dfe7683bc7)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/stack-alloc.jar (9d606124f003a3de084b5f7691981c8a)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/core/vecmath.jar (b12e74803effe5ac366ce331678047f8)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/jiw/jiw-gui.jar (ca89c70048d76ff9e267793b5f83b901)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/jiw/jiw-bytenetwork.jar (544d94f659adab4e93e95056b9284dec)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/server.jar (1e617fb2455c7bfe3b479291f1a1c9cd)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/commons.jar (9dcf498a0dc89b50435e342e7faf3cec)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/lib/sqlite-jdbc.jar (5fa420d75512d78ba9b08143ddca61b7)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/lib/luaj.jar (35b99210e527b306ca52158f1479894d)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/interface.jar (77b5637ab629b482e4bd1d36b02f43be)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/materials.jar (5d7dbbe2653a8726ae642b690b550365)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/models.jar (8e207cbb810e39dbab5b898804b63bfe)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/music.jar (e0fecc38d7756a9706e59c54f80b2c55)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/sounds.jar (dd97905a718b58b255dac9e88716e800)
C:/Program Files (x86)/Steam/steamapps/common/RisingWorld/data/assets/textures.jar (2a8963b380b8c8fad4f5f5cb1564e35f)

/////////////////////////////////////////////////////////////////////////////////
Error details:
java.lang.reflect.InvocationTargetException
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
java.lang.reflect.Constructor.newInstance(Unknown Source)
content.util.ClientUtils$ConversionUtils.fillItemsIntoSlots(SourceFile:624)
content.util.ClientUtils$ConversionUtils.byteArrayToInventory(SourceFile:593)
an.Q.call(SourceFile:487)
com.jme3.app.AppTask.invoke(AppTask.java:142)
com.jme3.app.Application.runQueuedTasks(Application.java:583)
com.jme3.app.Application.update(Application.java:596)
commons.JIWApplication.update(SourceFile:58)
com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:185)
com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:228)
java.lang.Thread.run(Unknown Source)

Indeed I am an admin on that server. Now that you mentioned it, I was giving myself some lumber using the 'item' command when it crashed. Maybe we could make the program "Ivan-proof" so this doesn't happen to others, or have a more user friendly fix?

I can make the same thing happen in single player mode by trying to give myself item 002. Hey, this is Alpha and we are testers after all!