[Problem] Crashe serwerowe

[mateuszp120]

Witam posiadam spigota 1.8 nie pamiętam jaki update, ale z przed kilku miesięcy i co jakiś czas serwer się crashuje z powodem: 

java.lang.IllegalArgumentException: Cannot set property BlockStateEnum{name=variant, clazz=class net.minecraft.server.v1_8_R1.EnumLogVariant, values=[acacia, dark_oak]} to oak on block minecraft:leaves2, it is not an allowed value
	at net.minecraft.server.v1_8_R1.BlockData.set(SourceFile:124)
	at net.minecraft.server.v1_8_R1.BlockLeaves2.fromLegacyData(SourceFile:65)
	at org.bukkit.craftbukkit.v1_8_R1.block.CraftBlock.setTypeIdAndData(CraftBlock.java:128)
	at org.bukkit.craftbukkit.v1_8_R1.block.CraftBlock.setTypeId(CraftBlock.java:124)
	at org.bukkit.craftbukkit.v1_8_R1.block.CraftBlockState.update(CraftBlockState.java:144)
	at org.bukkit.craftbukkit.v1_8_R1.block.CraftBlockState.update(CraftBlockState.java:136)
	at net.minecraft.server.v1_8_R1.BlockSapling.b(BlockSapling.java:51)
	at net.minecraft.server.v1_8_R1.Block.a(Block.java:258)
	at net.minecraft.server.v1_8_R1.WorldServer.h(WorldServer.java:483)
	at net.minecraft.server.v1_8_R1.WorldServer.doTick(WorldServer.java:242)
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:742)
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316)
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:625)
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:528)
	at java.lang.Thread.run(Thread.java:745)

Kto wie jak mogę to naprawić ?