build: 5.5.3
server: spigot latest
perm: pex

Not sure what made this although I found one other AS crash issue accidently which is punching the "enderdragon crystal" while in creative.

07.12 00:27:38 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at java.lang.reflect.Method.invoke(Method.java:601) ~[?:1.7.0_17]
07.12 00:27:38 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_17]
07.12 00:27:38 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_17]
07.12 00:27:38 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_17]
07.12 00:27:38 [Server] INFO at com.turt2live.antishare.ASListener.onEntityInteract(ASListener.java:1199) ~[?:?]
07.12 00:27:38 [Server] INFO at com.turt2live.antishare.util.Messages.notifyParties(Messages.java:174) ~[?:?]
07.12 00:27:38 [Server] INFO Caused by: java.lang.IllegalArgumentException: Null arguments are not allowed
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:442) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:530) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:647) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.handle(SourceFile:10) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.a(SourceFile:55) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1067) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:38 [Server] INFO org.bukkit.event.EventException
07.12 00:27:38 [Server] ERROR Could not pass event PlayerInteractEntityEvent to AntiShare v5.5.3-SNAPSHOT

07.12 00:27:14 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at java.lang.reflect.Method.invoke(Method.java:601) ~[?:1.7.0_17]
07.12 00:27:14 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_17]
07.12 00:27:14 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_17]
07.12 00:27:14 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_17]
07.12 00:27:14 [Server] INFO at com.turt2live.antishare.ASListener.onEntityInteract(ASListener.java:1199) ~[?:?]
07.12 00:27:14 [Server] INFO at com.turt2live.antishare.util.Messages.notifyParties(Messages.java:174) ~[?:?]
07.12 00:27:14 [Server] INFO Caused by: java.lang.IllegalArgumentException: Null arguments are not allowed
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:442) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:530) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:647) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.handle(SourceFile:10) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.a(SourceFile:55) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1067) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478) [craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:47) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427) ~[craftbukkit.jar:git-Spigot-1171]
07.12 00:27:14 [Server] INFO org.bukkit.event.EventException
07.12 00:27:14 [Server] ERROR Could not pass event PlayerInteractEntityEvent to AntiShare v5.5.3-SNAPSHOT

Cannot reproduce. If the issue persists, please let me know