Hi. Server crashed and stoping.

[16:38:10] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_11_R1.ReportedException: Ticking entity
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:825) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [server.jar:git-Spigot-3fb9445-36e3402]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388) ~[?:1.8.0_121]
at net.minecraft.server.v1_11_R1.EnchantmentWeaponDamage.a(SourceFile:94) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager$EnchantmentModifierArthropods.a(SourceFile:208) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.a(SourceFile:109) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.a(SourceFile:116) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.b(SourceFile:218) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityArrow.a(EntityArrow.java:304) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityArrow.A_(EntityArrow.java:194) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityTippedArrow.A_(EntityTippedArrow.java:86) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.entityJoinedWorld(World.java:1631) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.h(World.java:1606) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.tickEntities(World.java:1432) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.WorldServer.tickEntities(WorldServer.java:618) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:814) ~[server.jar:git-Spigot-3fb9445-36e3402]
... 4 more
[16:38:10] [Server thread/ERROR]: Cause of unexpected exception was
java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388) ~[?:1.8.0_121]
at net.minecraft.server.v1_11_R1.EnchantmentWeaponDamage.a(SourceFile:94) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager$EnchantmentModifierArthropods.a(SourceFile:208) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.a(SourceFile:109) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.a(SourceFile:116) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EnchantmentManager.b(SourceFile:218) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityArrow.a(EntityArrow.java:304) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityArrow.A_(EntityArrow.java:194) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.EntityTippedArrow.A_(EntityTippedArrow.java:86) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.entityJoinedWorld(World.java:1631) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.h(World.java:1606) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.World.tickEntities(World.java:1432) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.WorldServer.tickEntities(WorldServer.java:618) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:814) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) ~[server.jar:git-Spigot-3fb9445-36e3402]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [server.jar:git-Spigot-3fb9445-36e3402]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
[16:38:10] [Server thread/ERROR]: This crash report has been saved to: /home/root/multicraft/servers/Survival/./crash-reports/crash-2017-05-14_16.38.10-server.txt
[16:38:10] [Server thread/INFO]: Stopping server

Please fix it.