[21:27:43 ERROR]: Could not pass event SignChangeEvent to MachineGuardReloaded v2.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:338) ~[JavaPluginLoader$1.class:1.7.10-1614.57]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[RegisteredListener.class:1.7.10-1614.57]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:507) [SimplePluginManager.class:1.7.10-1614.57]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:492) [SimplePluginManager.class:1.7.10-1614.57]
        at net.minecraft.network.NetHandlerPlayServer.func_147343_a(NetHandlerPlayServer.java:2348) [nh.class:?]
        at net.minecraft.network.play.client.C12PacketUpdateSign.func_148833_a(SourceFile:48) [jn.class:?]
        at net.minecraft.network.play.client.C12PacketUpdateSign.func_148833_a(SourceFile:9) [jn.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:245) [ej.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:181) [nc.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:1023) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432) [lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) [MinecraftServer.class:?]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]
Caused by: java.lang.NullPointerException
        at ru.onlymc.machineguard.MachineGuardAPI.getDoublePartOfBlock(MachineGuardAPI.java:93) ~[?:?]
        at ru.onlymc.machineguard.MachineGuardAPI.checkIsSignExists(MachineGuardAPI.java:27) ~[?:?]
        at ru.onlymc.machineguard.MGRListener.onLock(MGRListener.java:47) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor249.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:334) ~[JavaPluginLoader$1.class:1.7.10-1614.57]
        ... 13 more