[12:48:15] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_15_R1.ReportedException: Ticking entity
        at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:1095) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:406) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:984) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:824) [spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
Caused by: java.lang.IllegalArgumentException: bound must be positive
        at java.util.Random.nextInt(Unknown Source) ~[?:1.8.0_201]
        at net.minecraft.server.v1_15_R1.DragonControllerHold.j(SourceFile:70) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.DragonControllerHold.c(SourceFile:37) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityEnderDragon.movementTick(EntityEnderDragon.java:179) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityLiving.tick(EntityLiving.java:2353) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityInsentient.tick(EntityInsentient.java:275) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.WorldServer.entityJoinedWorld(WorldServer.java:626) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.World.a(World.java:688) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.WorldServer.doTick(WorldServer.java:395) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:1082) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        ... 4 more
[12:48:15] [Server thread/ERROR]:       Cause of unexpected exception was
java.lang.IllegalArgumentException: bound must be positive
        at java.util.Random.nextInt(Unknown Source) ~[?:1.8.0_201]
        at net.minecraft.server.v1_15_R1.DragonControllerHold.j(SourceFile:70) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.DragonControllerHold.c(SourceFile:37) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityEnderDragon.movementTick(EntityEnderDragon.java:179) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityLiving.tick(EntityLiving.java:2353) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.EntityInsentient.tick(EntityInsentient.java:275) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.WorldServer.entityJoinedWorld(WorldServer.java:626) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.World.a(World.java:688) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.WorldServer.doTick(WorldServer.java:395) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.b(MinecraftServer.java:1082) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.DedicatedServer.b(DedicatedServer.java:406) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.a(MinecraftServer.java:984) ~[spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:824) [spigot.jar:git-Spigot-8faa8b4-3d61a85]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
[12:48:15] [Server thread/ERROR]: This crash report has been saved to: G:\Minecraft_Server\QuestServer MAIN\.\crash-reports\crash-2020-03-04_12.48.15-server.txt