Bukkit

What steps will reproduce the problem?
1. Get a commandblock
2. Place a commandblock

What is the expected output? What do you see instead?
A Properly working command block
I see a command block that won't save/set commands and function properly

What version of the product are you using?
1.0.3

Do you have an error log of what happened?
[SafeCommandBlock] Unhandled exception occured in onPacketReceiving(PacketEvent) for SafeCommandBlock
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
    at java.lang.String.substring(String.java:1875) ~[?:1.7.0_51]
    at me.KevinW1998.SafeCommandBlock.SafeCommandBlock.getRootCmd(SafeCommandBlock.java:340) ~[SafeCommandBlock.jar:?]
    at me.KevinW1998.SafeCommandBlock.SafeCommandBlock$1.onPacketReceiving(SafeCommandBlock.java:61) ~[SafeCommandBlock.jar:?]
    at com.comphenix.protocol.injector.SortedPacketListenerList.invokeReceivingListener(SortedPacketListenerList.java:114) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.SortedPacketListenerList.invokePacketRecieving(SortedPacketListenerList.java:67) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.PacketFilterManager.handlePacket(PacketFilterManager.java:599) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.PacketFilterManager.invokePacketRecieving(PacketFilterManager.java:566) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.netty.NettyProtocolInjector.packetReceived(NettyProtocolInjector.java:300) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.netty.NettyProtocolInjector.onPacketReceiving(NettyProtocolInjector.java:260) [ProtocolLib-3.2.0.jar:?]
    at com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:303) [ProtocolLib-3.2.0.jar:?]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:232) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:131) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:173) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:149) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.invokeChannelRead(DefaultChannelHandlerContext.java:337) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelHandlerContext.fireChannelRead(DefaultChannelHandlerContext.java:323) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:785) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:100) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.util.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at java.lang.Thread.run(Thread.java:744) [?:1.7.0_51]
[19:38:38 ERROR]: Parameters:
  net.minecraft.server.v1_7_R1.PacketPlayInCustomPayload@23626c05[
    tag=MC|AdvCdm
    length=256
    data={0,-1,-1,-1,-65,0,0,0,-128,0,0,0,-108,8,52,113,114,119,100,116,102,103,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
timestamp=1403145518842
  ]

Please provide any additional information below.
Please fix this problem soon. I really enjoy your plugin but so far it isn't going so well.

what did you enter for a command?

Did you try to write your command with "/"?