After some time server crashes randomly heres crashlog: ---- Minecraft Crash Report ---- // Why is it breaking Time: 4/4/22, 9:21 PM Description: Exception in server tick loop java.lang.ClassCastException: class org.bukkit.material.MaterialData cannot be cast to class org.bukkit.Material (org.bukkit.material.MaterialData and org.bukkit.Material are in unnamed module of loader cpw.mods.modlauncher.TransformingClassLoader @79696332) at java.util.Map.computeIfAbsent(Map.java:1003) ~[?:?] {} at co.aikar.util.LoadingMap.get(LoadingMap.java:274) ~[forge:?] {re:classloading} at co.aikar.util.MRUMapCache.get(MRUMapCache.java:65) ~[forge:?] {re:classloading} at co.aikar.timings.TimingHistory$2.apply(TimingHistory.java:127) ~[forge:?] {re:classloading} at co.aikar.timings.TimingHistory$2.apply(TimingHistory.java:108) ~[forge:?] {re:classloading} at co.aikar.util.JSONUtil.toObjectMapper(JSONUtil.java:119) ~[forge:?] {re:classloading} at co.aikar.timings.TimingHistory.<init>(TimingHistory.java:108) ~[forge:?] {re:classloading} at co.aikar.timings.FullServerTickHandler.stopTiming(FullServerTickHandler.java:76) ~[forge:?] {re:classloading} at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:1055) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:821) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:269) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at java.lang.Thread.run(Thread.java:834) [?:?] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- System Details -- Details: Minecraft Version: 1.16.5 Minecraft Version ID: 1.16.5 Mohist Version: 1.16.5-963 Operating System: Linux (amd64) version 4.19.0-9-amd64 Java Version: 11.0.6, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 868801768 bytes (828 MB) / 1919389696 bytes (1830 MB) up to 4151836672 bytes (3959 MB) CPUs: 2 JVM Flags: 3 total; -Xms128M -Xmx4096M -XX:+UseSerialGC ModLauncher: 8.1.3+8.1.3+main-8.1.x.c94d18ec ModLauncher launch target: fmlserver ModLauncher naming: srg ModLauncher services: /mixin-0.8.4.jar mixin PLUGINSERVICE /eventbus-4.0.0.jar eventbus PLUGINSERVICE /mohist-1.16.5-963-server.jar object_holder_definalize PLUGINSERVICE /mohist-1.16.5-963-server.jar runtime_enum_extender PLUGINSERVICE /mohist-1.16.5-963-server.jar capability_inject_definalize PLUGINSERVICE /accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE /mohist-1.16.5-963-server.jar runtimedistcleaner PLUGINSERVICE /mixin-0.8.4.jar mixin TRANSFORMATIONSERVICE /mohist-1.16.5-963-server.jar fml TRANSFORMATIONSERVICE FML: 36.2 Forge: com.mohistmc:36.2.33 FML Language Providers: [email protected] [email protected]