[23:20:19 ERROR]: Could not pass event PlayerInteractEvent to Skyblock v1.7
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:299) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerInteractManager.a(PlayerInteractManager.java:457) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1237) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_201]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_201]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:895) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:830) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:728) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
Caused by: java.lang.NullPointerException
        at me.dreamsteal.events.SignEvt.lambda$0(SignEvt.java:83) ~[?:?]
        at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[?:1.8.0_201]
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.IntPipeline.reduce(Unknown Source) ~[?:1.8.0_201]
        at java.util.stream.IntPipeline.sum(Unknown Source) ~[?:1.8.0_201]
        at me.dreamsteal.events.SignEvt.condenseItem(SignEvt.java:86) ~[?:?]
        at me.dreamsteal.events.SignEvt.onPlayerInteract(SignEvt.java:41) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_201]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_201]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_201]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        ... 17 more