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Server will crash at random with a ConcurrentModificationException


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Hello, my server crashes at random with the following error:
Exception in server tick loop java.util.ConcurrentModificationException: null
I've hosted numerous minecraft servers before and never encountered this error. The crashes started about 2 days ago, prior to that the server was fine. Most clients run OptiFine in conjunction with forge version 35.1.36. Here's the full error log:
 

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 2/14/21, 10:40 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException: null
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1043) ~[?:?] {}
    at java.util.ArrayList$Itr.remove(ArrayList.java:1011) ~[?:?] {}
    at com.blamejared.clumps.Clumps.update(Clumps.java:60) ~[clumps:6.0.0.13] {re:classloading,pl:object_holder_definalize:A}
    at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:247) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:239) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.fml.hooks.BasicEventHooks.onPostWorldTick(BasicEventHooks.java:100) ~[forge:?] {re:classloading}
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:856) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:786) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:641) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at java.lang.Thread.run(Thread.java:834) [?:?] {}

And the mod list:

    Mod List: 
        forge-1.16.5-36.0.14-server.jar                   |Minecraft                     |minecraft                     |1.16.5              |DONE      |NOSIGNATURE
        logprot-1.16-1.3.jar                              |Logprot                       |logprot                       |1.3                 |DONE      |NOSIGNATURE
        voicechat-1.16.4-1.1.5.jar                        |Simple Voice Chat             |voicechat                     |1.16.4-1.1.5        |DONE      |NOSIGNATURE
        repurposed_structures-1.16.4-2.3.4.jar            |Repurposed Structures         |repurposed_structures         |1.16.4-2.3.4        |DONE      |NOSIGNATURE
        doubledoors_1.16.4-2.1.jar                        |Double Doors                  |doubledoors                   |2.1                 |DONE      |NOSIGNATURE
        theoneprobe-1.16-3.0.7.jar                        |The One Probe                 |theoneprobe                   |1.16-3.0.7          |DONE      |NOSIGNATURE
        Instrumental-Mobs-1.16.3-1.3.1.jar                |Instrumental Mobs             |instrumentalmobs              |1.3.1               |DONE      |NOSIGNATURE
        NetherPortalFix_1.16.3-7.2.1.jar                  |NetherPortalFix               |netherportalfix               |7.2.1               |DONE      |NOSIGNATURE
        snad-1.0.3-1.16.4.jar                             |Snad                          |snad                          |1.0.3               |DONE      |NOSIGNATURE
        jei-1.16.4-7.6.1.65.jar                           |Just Enough Items             |jei                           |7.6.1.65            |DONE      |NOSIGNATURE
        abnormals_core-1.16.4-3.0.6.jar                   |Abnormals Core                |abnormals_core                |3.0.6               |DONE      |NOSIGNATURE
        KleeSlabs_1.16.3-9.2.0.jar                        |KleeSlabs                     |kleeslabs                     |9.2.0               |DONE      |NOSIGNATURE
        extraboats-1.16.5-2.1.0.jar                       |Extra Boats                   |extraboats                    |2.1.0               |DONE      |NOSIGNATURE
        create-mc1.16.3_v0.3e.jar                         |Create                        |create                        |mc1.16.3_v0.3e      |DONE      |NOSIGNATURE
        BetterCaves-Forge-1.16.4-1.1.1.jar                |YUNG's Better Caves           |bettercaves                   |1.16.4-1.1.1        |DONE      |NOSIGNATURE
        collective-1.16.4-1.53.jar                        |Collective                    |collective                    |1.53                |DONE      |NOSIGNATURE
        Clumps-6.0.0.13.jar                               |Clumps                        |clumps                        |6.0.0.13            |DONE      |NOSIGNATURE
        FastWorkbench-1.16.4-4.5.0.jar                    |FastWorkbench                 |fastbench                     |4.5.0               |DONE      |NOSIGNATURE
        Placebo-1.16.4-4.4.1.jar                          |Placebo                       |placebo                       |4.4.1               |DONE      |NOSIGNATURE
        sit-1.16.2-v1.3.jar                               |Sit                           |sit                           |v1.3                |DONE      |NOSIGNATURE
        performant-1.16.2-4-3.30m.jar                     |Performant                    |performant                    |3.30m               |DONE      |NOSIGNATURE
        YungsApi-1.16.4-Forge-3.jar                       |YUNG's API                    |yungsapi                      |1.16.4-Forge-3      |DONE      |NOSIGNATURE
        netheritehorsearmor-1.6.jar                       |Netherite Horse Armor Mod     |netheritehorsearmor           |1.5                 |DONE      |NOSIGNATURE
        randompatches-2.1.5-forge.jar                     |RandomPatches                 |randompatches                 |2.1.5-forge         |DONE      |92:f6:29:d4:09:89:f5:f5:98:5e:20:34:31:d0:7b:58:22:06:bd:a5:d1:6a:92:6e:ac:3d:8d:18:c5:b2:5b:d7
        FastFurnace-1.16.4-4.4.0.jar                      |FastFurnace                   |fastfurnace                   |4.4.0               |DONE      |NOSIGNATURE
        Morpheus-1.16.4-4.2.68.jar                        |Morpheus                      |morpheus                      |4.2.68              |DONE      |NOSIGNATURE
        bedspreads-forge-1.16.4-5.1.0.1.jar               |Bedspreads                    |bedspreads                    |1.16.4-5.1.0.1      |DONE      |NOSIGNATURE
        AI-Improvements-1.16.2-0.3.0.jar                  |AI-Improvements               |aiimprovements                |0.3.0               |DONE      |NOSIGNATURE
        Toast-Control-1.16.4-4.3.1.jar                    |Toast Control                 |toastcontrol                  |4.3.1               |DONE      |NOSIGNATURE
        SnowRealMagic-1.16.4-2.3.0.jar                    |Snow! Real Magic!             |snowrealmagic                 |2.3.0               |DONE      |NOSIGNATURE
        Kiwi-1.16.3-3.4.1.jar                             |Kiwi                          |kiwi                          |3.4.1               |DONE      |NOSIGNATURE
        easyelytrato_1.16.4-1.5.jar                       |Easy Elytra Takeoff           |easyelytrato                  |1.5                 |DONE      |NOSIGNATURE
        dynviewdist-1.8.jar                               |Dynamic view distance         |dynview                       |1.8                 |DONE      |NOSIGNATURE
        traverse-1.16.4-0.4.3.8.jar                       |Traverse: Reforged            |traverse                      |1.16.4-0.4.3.8      |DONE      |NOSIGNATURE
        TrampleStopper-2.4.8 mc-1.16.4.jar                |Trample Stopper               |tramplestopper                |2.4.8+mc-1.16.4     |DONE      |23:8f:95:0f:65:ec:2e:38:99:79:f4:bc:47:8a:0b:df:29:ef:2d:82:66:20:09:20:02:dc:4a:15:97:45:f8:43
        JustEnoughResources-1.16.4-0.12.0.104.jar         |Just Enough Resources         |jeresources                   |0.12.0.104          |DONE      |NOSIGNATURE
        horsestandstill-1.16.3-1.0.1.jar                  |Stupid Horse Stand Still      |horsestandstill               |1.16.3-1.0.1        |DONE      |1f:47:ac:b1:61:82:96:b8:47:19:16:d2:61:81:11:60:3a:06:4b:61:31:56:7d:44:31:1e:0c:6f:22:5b:4c:ed
        BetterThanMending-1.5.1.jar                       |BetterThanMending             |betterthanmending             |1.5.1               |DONE      |NOSIGNATURE
        BetterBurning-1.16.4-5.0.3.jar                    |BetterBurning                 |betterburning                 |5.0.3               |DONE      |eb:c4:b1:67:8b:f9:0c:db:dc:4f:01:b1:8e:61:64:39:4c:10:85:0b:a6:c4:c7:48:f0:fa:95:f2:cb:08:3a:e5
        bwncr-1.16.4-3.9.16.jar                           |Bad Wither No Cookie Reloaded |bwncr                         |1.16.4-3.9.16       |DONE      |NOSIGNATURE
        bettertridentreturn-1.16.4-1.0.1.jar              |Better Trident Return         |bettertridentreturn           |1.0.1               |DONE      |NOSIGNATURE
        forge-1.16.5-36.0.14-universal.jar                |Forge                         |forge                         |36.0.14             |DONE      |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
        Waddles-1.16.4-0.8.11.jar                         |Waddles                       |waddles                       |1.16.4-0.8.11       |DONE      |NOSIGNATURE
        MmmMmmMmmMmm-1.16-1.0.1.jar                       |MmmMmmMmmMmm                  |dummmmmmy                     |1.0.1               |DONE      |NOSIGNATURE
        ServerTabInfo-1.16.4-1.3.3.jar                    |Server Tab Info               |servertabinfo                 |1.3.3               |DONE      |NOSIGNATURE
        PrettyBeaches_1.16.3-5.2.0.jar                    |Pretty Beaches                |prettybeaches                 |5.2.0               |DONE      |NOSIGNATURE
        PathToDirt-1.1.0-mc1.16.x.jar                     |Path To Dirt                  |pathtodirt                    |1.1.0               |DONE      |NOSIGNATURE
        CraftingTweaks_1.16.3-12.2.0.jar                  |Crafting Tweaks               |craftingtweaks                |12.2.0              |DONE      |NOSIGNATURE

Any help is appreciated!

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