Server Crash: Ticking block Entity

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    [16:43:35] [Server thread/ERROR]: Encountered an unexpected exception
    121net.minecraft.ReportedException: Ticking entity
    122at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:886) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    123at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:334) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    124at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:818) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    125at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:683) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    126at net.minecraft.server.MinecraftServer.m_177918_(MinecraftServer.java:258) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    127at java.lang.Thread.run(Thread.java:831) [?:?]
    128Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.world.level.material.FlowingFluid.m_76108_(net.minecraft.tags.Tag)" because "this.f_54689_" is null
    129at net.minecraft.world.level.block.LiquidBlock.m_7357_(LiquidBlock.java:83) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    130at net.minecraft.world.level.block.state.BlockBehaviour$BlockStateBase.m_60647_(BlockBehaviour.java:673) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    131at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_77643_(WalkNodeEvaluator.java:509) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    132at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_77604_(WalkNodeEvaluator.java:411) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    133at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_8086_(WalkNodeEvaluator.java:404) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    134at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_77580_(WalkNodeEvaluator.java:359) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    135at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_7209_(WalkNodeEvaluator.java:330) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    136at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_77561_(WalkNodeEvaluator.java:399) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    137at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.computeIfAbsent(Long2ObjectOpenHashMap.java:479) ~[server-1.17.1-20210706.113038-extra.jar%2323!:?]
    138at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_77567_(WalkNodeEvaluator.java:398) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    139at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_164725_(WalkNodeEvaluator.java:224) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    140at net.minecraft.world.level.pathfinder.WalkNodeEvaluator.m_6065_(WalkNodeEvaluator.java:145) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    141at net.minecraft.world.level.pathfinder.PathFinder.m_164716_(SourceFile:102) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    142at net.minecraft.world.level.pathfinder.PathFinder.m_77427_(SourceFile:47) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    143at net.minecraft.world.entity.ai.navigation.PathNavigation.m_148222_(PathNavigation.java:144) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    144at net.minecraft.world.entity.ai.navigation.PathNavigation.m_26551_(PathNavigation.java:126) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    145at net.minecraft.world.entity.ai.navigation.PathNavigation.m_7864_(PathNavigation.java:111) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    146at net.minecraft.world.entity.ai.navigation.GroundPathNavigation.m_7864_(SourceFile:51) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    147at net.minecraft.world.entity.ai.navigation.PathNavigation.m_26524_(PathNavigation.java:96) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    148at net.minecraft.world.entity.ai.navigation.PathNavigation.m_26519_(PathNavigation.java:157) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    149at net.minecraft.world.entity.ai.goal.RandomStrollGoal.m_8056_(SourceFile:77) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    150at net.minecraft.world.entity.ai.goal.WrappedGoal.m_8056_(SourceFile:41) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    151at net.minecraft.world.entity.ai.goal.GoalSelector.m_25368_(SourceFile:83) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    152at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?]
    153at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
    154at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
    155at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
    156at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]
    157at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?]
    158at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:?]
    159at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[?:?]
    160at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?]
    161at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?]
    162at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?]
    163at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
    164at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
    165at net.minecraft.world.entity.ai.goal.GoalSelector.m_25373_(SourceFile:77) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    166at net.minecraft.world.entity.Mob.m_6140_(Mob.java:685) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    167at net.minecraft.world.entity.LivingEntity.m_8107_(LivingEntity.java:2494) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    168at net.minecraft.world.entity.Mob.m_8107_(Mob.java:491) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    169at net.minecraft.world.entity.AgeableMob.m_8107_(SourceFile:127) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    170at net.minecraft.world.entity.animal.Animal.m_8107_(Animal.java:51) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    171at net.minecraft.world.entity.animal.horse.AbstractHorse.m_8107_(AbstractHorse.java:521) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    172at net.minecraft.world.entity.LivingEntity.m_8119_(LivingEntity.java:2241) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    173at net.minecraft.world.entity.Mob.m_8119_(Mob.java:303) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    174at net.minecraft.world.entity.animal.horse.AbstractHorse.m_8119_(AbstractHorse.java:557) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    175at net.minecraft.server.level.ServerLevel.m_8647_(ServerLevel.java:623) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    176at net.minecraft.world.level.Level.m_46653_(Level.java:488) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    177at net.minecraft.server.level.ServerLevel.m_143264_(ServerLevel.java:384) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    178at net.minecraft.world.level.entity.EntityTickList.m_156910_(SourceFile:54) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    179at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:365) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    180at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:882) ~[server-1.17.1-20210706.113038-srg.jar%2326!:?]
    181... 5 more
    182

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