Seems to happen when we use grenades. I snooped out this errormessage aswell.
Im a developer but not to familiar with java/minecraft developing so not sure what logs that are relevant. If more info is needed let me know and i'll grab it.

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 7/2/20 3:24 PM
Description: Ticking entity

java.lang.NoSuchMethodError: net.minecraft.world.World.func_195590_a(Lnet/minecraft/particles/IParticleData;ZDDDDDD)V
at com.mrcrayfish.guns.entity.ThrowableGrenadeEntity.func_70071_h_(ThrowableGrenadeEntity.java:63) ~[?:0.16.0-1.15.2] {re:classloading}
at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:600) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_217390_a(World.java:536) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:401) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:849) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:cgm:knockback,pl:runtimedistcleaner:A}
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) ~[?:?] {re:classloading,pl:accesstransformer:B,xf:fml:cgm:knockback,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [?:?] {re:classloading,pl:accesstransformer:B,xf:fml:cgm:knockback,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212] {}

-- Head --
Thread: Server thread
Stacktrace:
at com.mrcrayfish.guns.entity.ThrowableGrenadeEntity.func_70071_h_(ThrowableGrenadeEntity.java:63)
at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:600)

-- Entity being ticked --
Details:
Entity Type: cgm:throwable_grenade (com.mrcrayfish.guns.entity.ThrowableGrenadeEntity)
Entity ID: 8403
Entity Name: entity.cgm.throwable_grenade
Entity's Exact location: -304.97, 78.81, 187.74
Entity's Block location: World: (-305,78,187), Chunk: (at 15,4,11 in -20,11; contains blocks -320,0,176 to -305,255,191), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.54, -0.49, 0.55
Entity's Passengers: []
Entity's Vehicle: ERROR NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_217390_a(World.java:536)
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:401)

    Mod List:
            forge-1.15.2-31.2.0-server.jar Minecraft {[email protected] DONE}
            obfuscate-0.4.3-1.15.2.jar Obfuscate {[email protected] DONE}
            betteranimalsplus-1.15.2-8.2.1.96.jar Better Animals Plus {[email protected] DONE}
            forge-1.15.2-31.2.0-universal.jar Forge {[email protected] DONE}
            Aquaculture-1.15.2-2.0.14.jar Aquaculture 2 {[email protected] DONE}
            cgm-0.16.0-mc1.15.2.jar MrCrayfish's Gun Mod {[email protected] DONE}
            BiomesOPlenty-1.15.2-10.0.0.363-universal.jar Biomes O' Plenty {[email protected] DONE}
            Xaeros_Minimap_20.14.0_Forge_1.15.2.jar Xaero's Minimap {[email protected] DONE}
            XaerosWorldMap_1.6.4_Forge_1.15.2.jar Xaero's World Map {[email protected] DONE}
            venture-1.0.0-mc1.15.2.jar Venture {[email protected] DONE}
            vehicle-0.44.0-mc1.15.2.jar MrCrayfish's Vehicle Mod {[email protected] DONE}

Fixed in aa0a671