Just added the mod (was so excited it got updated, adore this mod) Went online to test. I was killed by another player several times, my grave never spawned. Server crashed when i was killed by a Zombie twice.

Nothing showed in the logs.

Crash 1: https://mclo.gs/n74k7wU

Crash 2: https://mclo.gs/M1EtkFi

Fabric: 0.14.24
Fabric API: 0.91.0
YIGD: 2.0.0 beta 4

Config:
{ "inventoryConfig": { "dropPlayerHead": false, "itemLoss": { "enabled": false, "affectStacks": false, "usePercentRange": true, "lossRangeFrom": 0, "lossRangeTo": 100, "percentChanceOfLoss": 50, "canLoseSoulbound": false }, "vanishingEnchantments": [ "minecraft:vanishing_curse" ], "soulboundEnchantments": [ "yigd:soulbound" ], "loseSoulboundLevelOnDeath": true, "vanishingSlots": [], "soulboundSlots": [], "dropOnGroundSlots": [] }, "expConfig": { "dropBehaviour": "VANILLA", "dropPercentage": 50, "keepPercentage": 0 }, "graveConfig": { "enabled": true, "storeItems": true, "storeXp": true, "informGraveLocation": true, "requireItem": false, "requiredItem": "", "requireShovelToLoot": false, "retrieveMethods": { "onClick": true, "onBreak": false, "onSneak": false, "onStand": false }, "mergeStacksOnRetrieve": true, "dropOnRetrieve": "IN_INVENTORY", "dropGraveBlock": true, "generateEmptyGraves": false, "overrideSpawnProtection": true, "claimPriority": "GRAVE", "graveRobbing": { "enabled": false, "onlyMurderer": false, "afterTime": 1, "timeUnit": "HOURS", "robPriority": "INVENTORY", "notifyWhenRobbed": true, "tellWhoRobbed": true }, "graveTimeout": { "enabled": false, "afterTime": 30, "timeUnit": "HOURS", "dropContentsOnTimeout": false }, "treatBindingCurse": true, "generateGraveInVoid": false, "lowestGraveY": 3, "generateOnlyWithinBorder": true, "ignoredDeathTypes": [], "unlockable": true, "randomSpawn": { "percentSpawnChance": 5, "spawnEntity": "minecraft:zombie", "spawnNbt": "{ArmorItems:[{},{},{},{id:\"minecraft:player_head\",tag:{SkullOwner:{Name:\"${name}\",Id:\"${uuid}\"}},Count:1b}]}" }, "generateOnLastGroundPos": true, "generationMaxDistance": { "x": 5, "y": 5, "z": 5 }, "useSoftBlockWhitelist": false, "useStrictBlockBlacklist": true, "replaceOldWhenClaimed": true, "persistentGraves": { "enabled": false, "showDeathDay": true, "showDeathIrlTime": true, "useAmPm": true }, "dimensionBlacklist": [], "blockUnderGrave": { "enabled": true, "blockInDimensions": [ { "key": "minecraft:overworld", "value": "minecraft:cobblestone" }, { "key": "minecraft:the_nether", "value": "minecraft:soul_soil" }, { "key": "minecraft:the_end", "value": "minecraft:end_stone" }, { "key": "misc", "value": "minecraft:dirt" } ], "generateOnProtectedLand": true }, "sellOutOfflinePeople": false, "maxBackupsPerPerson": 25, "dropFromOldestWhenDeleted": true }, "respawnConfig": { "respawnEffects": [], "respawnHealth": 20, "resetHunger": true, "respawnHunger": 20, "resetSaturation": true, "respawnSaturation": 20.0, "extraItemDrops": [] }, "compatConfig": { "standardDropRuleInClaim": "PUT_IN_GRAVE", "enableInventorioCompat": false, "defaultInventorioDropRule": "PUT_IN_GRAVE", "enableLevelzCompat": false, "defaultLevelzDropRule": "PUT_IN_GRAVE", "enableNumismaticOverhaulCompat": true, "defaultNumismaticDropRule": "PUT_IN_GRAVE", "enableOriginsInventoryCompat": true, "defaultOriginsDropRule": "PUT_IN_GRAVE", "enableTravelersBackpackCompat": true, "defaultTravelersBackpackDropRule": "PUT_IN_GRAVE", "enableTrinketsCompat": true, "defaultTrinketsDropRule": "PUT_IN_GRAVE" }, "commandConfig": { "mainCommand": "yigd", "basePermissionLevel": 0, "viewLatestPermissionLevel": 0, "viewSelfPermissionLevel": 0, "viewUserPermissionLevel": 2, "viewAllPermissionLevel": 2, "restorePermissionLevel": 2, "robPermissionLevel": 2, "whitelistPermissionLevel": 3, "deletePermissionLevel": 3, "unlockPermissionLevel": 0 }, "graveRendering": { "useCustomFeatureRenderer": true, "useSkullRenderer": true, "useTextRenderer": true, "adaptRenderer": false, "useGlowingEffect": true, "glowingDistance": 15 }, "extraFeatures": { "customSoulboundEnchant": true, "deathSightEnchant": { "enabled": false, "range": 64.0, "targets": "PLAYER_GRAVES" }, "graveKeys": { "enabled": false, "rebindable": true, "required": true, "receiveOnRespawn": true, "targeting": "PLAYER_GRAVE" }, "deathScroll": { "enabled": false, "rebindable": false, "receiveOnRespawn": false, "clickFunction": "VIEW_CONTENTS" } } }

I guess that's what I get for not really being bothered to test the last version. Anyway I've pushed a new release now, 2.0.0-beta.5, that will fix this issue. Should be live on a few minutes. (As of editing this, it's live now)
Thanks for letting me know about the issue, and do let me know if you find anything else worth reporting!