diff --git a/changelog.md b/changelog.md
index 05ba6a46..6fe534d1 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1 +1,3 @@
-- changed required Majrusz Library version from 6.0.0+ to 6.1.0+
\ No newline at end of file
+- changed required Majrusz Library version from 6.1.0+ to 6.1.7+
+- fixed game crash `java.lang.NullPointerException: Registry Object not present` (reported by @Note, @PlayfulPiano)
+- fixed exploit with duplicating items and chests (reported by @Ladocterus, @HeavyDeception)
\ No newline at end of file
diff --git a/common/libs/majrusz-library-common-1.20.1-6.1.0.jar b/common/libs/majrusz-library-common-1.20.1-6.1.7.jar
similarity index 78%
rename from common/libs/majrusz-library-common-1.20.1-6.1.0.jar
rename to common/libs/majrusz-library-common-1.20.1-6.1.7.jar
index 587a6827..51b728ee 100644
Binary files a/common/libs/majrusz-library-common-1.20.1-6.1.0.jar and b/common/libs/majrusz-library-common-1.20.1-6.1.7.jar differ
diff --git a/common/src/main/java/com/majruszsaccessories/MajruszsAccessories.java b/common/src/main/java/com/majruszsaccessories/MajruszsAccessories.java
index ba8c059d..5f7eb32f 100644
--- a/common/src/main/java/com/majruszsaccessories/MajruszsAccessories.java
+++ b/common/src/main/java/com/majruszsaccessories/MajruszsAccessories.java
@@ -15,16 +15,15 @@
 import com.mlib.annotation.Dist;
 import com.mlib.annotation.OnlyIn;
 import com.mlib.contexts.OnGameInitialized;
-import com.mlib.contexts.OnParticlesRegistered;
 import com.mlib.emitter.ParticleEmitter;
 import com.mlib.math.Random;
 import com.mlib.modhelper.ModHelper;
 import com.mlib.network.NetworkObject;
 import com.mlib.platform.Services;
+import com.mlib.registry.Custom;
 import com.mlib.registry.RegistryGroup;
 import com.mlib.registry.RegistryObject;
 import net.minecraft.core.particles.ParticleType;
-import net.minecraft.core.particles.SimpleParticleType;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.CreativeModeTab;
@@ -114,7 +113,9 @@ private MajruszsAccessories() {}
 	@OnlyIn( Dist.CLIENT )
 	public static class Client {
 		static {
-			OnParticlesRegistered.listen( data->data.register( BONUS_PARTICLE.get(), BonusParticle.Factory::new ) );
+			HELPER.create( Custom.Particles.class, particles->{
+				particles.register( BONUS_PARTICLE.get(), BonusParticle.Factory::new );
+			} );
 		}
 	}
 }
diff --git a/common/src/main/java/com/majruszsaccessories/accessories/AdventurerKit.java b/common/src/main/java/com/majruszsaccessories/accessories/AdventurerKit.java
index 0668563e..d52bad50 100644
--- a/common/src/main/java/com/majruszsaccessories/accessories/AdventurerKit.java
+++ b/common/src/main/java/com/majruszsaccessories/accessories/AdventurerKit.java
@@ -33,7 +33,7 @@ protected AnyChestDropChance( BonusHandler< AccessoryItem > handler ) {
 			super( handler );
 
 			MoreChestLoot.OnChestOpened.listen( this::addToGeneratedLoot )
-				.addCondition( CustomConditions.dropChance( ()->this.chance, data->data.entity ) );
+				.addCondition( CustomConditions.dropChance( ()->this.chance, data->MoreChestLoot.OnChestOpened.findPlayer( data ).orElse( null ) ) );
 
 			Serializable< ? > config = handler.getConfig();
 			config.defineFloat( "any_chest_spawn_chance", s->this.chance, ( s, v )->this.chance = Range.CHANCE.clamp( v ) );
diff --git a/common/src/main/java/com/majruszsaccessories/accessories/components/MoreChestLoot.java b/common/src/main/java/com/majruszsaccessories/accessories/components/MoreChestLoot.java
index 300c217f..17ab49f2 100644
--- a/common/src/main/java/com/majruszsaccessories/accessories/components/MoreChestLoot.java
+++ b/common/src/main/java/com/majruszsaccessories/accessories/components/MoreChestLoot.java
@@ -18,7 +18,6 @@
 import com.mlib.data.Serializable;
 import com.mlib.data.Serializables;
 import com.mlib.emitter.ParticleEmitter;
-import com.mlib.level.BlockHelper;
 import com.mlib.level.LevelHelper;
 import com.mlib.math.Random;
 import com.mlib.math.Range;
@@ -26,9 +25,7 @@
 import com.mlib.text.TextHelper;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.util.Mth;
-import net.minecraft.world.entity.LivingEntity;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.world.level.block.entity.RandomizableContainerBlockEntity;
 
 import java.util.Optional;
 import java.util.function.Consumer;
@@ -47,7 +44,7 @@ protected MoreChestLoot( BonusHandler< AccessoryItem > handler, float sizeMultip
 		this.sizeMultiplier.set( sizeMultiplier, Range.of( 0.0f, 10.0f ) );
 
 		OnChestOpened.listen( this::addExtraLoot )
-			.addCondition( CustomConditions.hasAccessory( this::getItem, data->( LivingEntity )data.entity ) );
+			.addCondition( CustomConditions.hasAccessory( this::getItem, data->OnChestOpened.findPlayer( data ).orElse( null ) ) );
 
 		this.addTooltip( "majruszsaccessories.bonuses.more_chest_loot", this.getPerPercentInfo(), this.getPercentInfo(), this.getCurrentInfo() );
 
@@ -56,7 +53,7 @@ protected MoreChestLoot( BonusHandler< AccessoryItem > handler, float sizeMultip
 	}
 
 	private void addExtraLoot( OnLootGenerated data ) {
-		ServerPlayer player = ( ServerPlayer )data.entity;
+		ServerPlayer player = OnChestOpened.findPlayer( data ).orElseThrow();
 		float sizeMultiplier = 1.0f + CustomConditions.getLastHolder().apply( this.sizeMultiplier ) * MoreChestLoot.getDistanceBonus( player );
 		boolean hasIncreasedLoot = false;
 		for( ItemStack itemStack : data.generatedLoot ) {
@@ -102,13 +99,19 @@ public static class OnChestOpened {
 		public static Context< OnLootGenerated > listen( Consumer< OnLootGenerated > consumer ) {
 			return OnLootGenerated.listen( consumer )
 				.addCondition( Condition.isLogicalServer() )
-				.addCondition( Condition.hasLevel() )
-				.addCondition( data->data.origin != null )
-				.addCondition( data->data.entity instanceof ServerPlayer )
-				.addCondition( data->{
-					return BlockHelper.getEntity( data.getLevel(), data.origin ) instanceof RandomizableContainerBlockEntity
-						|| data.lootId.toString().contains( "chest" );
-				} );
+				.addCondition( data->data.lootId.toString().contains( "chests/" ) );
+		}
+
+		public static Optional< ServerPlayer > findPlayer( OnLootGenerated data ) {
+			if( data.entity instanceof ServerPlayer player ) {
+				return Optional.of( player );
+			}
+
+			if( data.origin != null && data.level.getNearestPlayer( data.origin.x, data.origin.y, data.origin.z, 5.0f, true ) instanceof ServerPlayer player ) {
+				return Optional.of( player );
+			}
+
+			return Optional.empty();
 		}
 	}
 
diff --git a/fabric/libs/majrusz-library-fabric-1.20.1-6.1.0.jar b/fabric/libs/majrusz-library-fabric-1.20.1-6.1.7.jar
similarity index 79%
rename from fabric/libs/majrusz-library-fabric-1.20.1-6.1.0.jar
rename to fabric/libs/majrusz-library-fabric-1.20.1-6.1.7.jar
index d79ac8bf..3f548cb8 100644
Binary files a/fabric/libs/majrusz-library-fabric-1.20.1-6.1.0.jar and b/fabric/libs/majrusz-library-fabric-1.20.1-6.1.7.jar differ
diff --git a/forge/libs/majrusz-library-forge-1.20.1-6.1.0.jar b/forge/libs/majrusz-library-forge-1.20.1-6.1.7.jar
similarity index 75%
rename from forge/libs/majrusz-library-forge-1.20.1-6.1.0.jar
rename to forge/libs/majrusz-library-forge-1.20.1-6.1.7.jar
index 85625943..7515b112 100644
Binary files a/forge/libs/majrusz-library-forge-1.20.1-6.1.0.jar and b/forge/libs/majrusz-library-forge-1.20.1-6.1.7.jar differ
diff --git a/gradle.properties b/gradle.properties
index 78e09442..c693ade7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,7 +8,7 @@ minecraft_version_range=[1.20.1,)
 # Mod
 mod_id=majruszsaccessories
 mod_archives_name=majruszs-accessories
-mod_version=1.3.2
+mod_version=1.3.3
 mod_display_name=Majrusz's Accessories
 mod_description=Mod that adds new special accessories to make certain aspects of the game more enjoyable.
 mod_authors=Majrusz
@@ -23,7 +23,7 @@ mod_logo=logo.png
 forge_version=1.20.1-47.1.0
 forge_version_loader=[47,)
 forge_version_range=[47.1,)
-forge_mlib_version_range=[6.1.0,7.0.0)
+forge_mlib_version_range=[6.1.7,7.0.0)
 forge_curios_version=5.2.0-beta.3+1.20.1
 forge_curios_version_range=[5.2.0-beta.3+1.20.1,)
 
@@ -31,19 +31,19 @@ forge_curios_version_range=[5.2.0-beta.3+1.20.1,)
 neoforge_version=1.20.1-47.1.76
 neoforge_version_loader=[47,)
 neoforge_version_range=1.20.1-47.1.76
-neoforge_mlib_version_range=[6.1.0,7.0.0)
+neoforge_mlib_version_range=[6.1.7,7.0.0)
 neoforge_curios_version=5.2.0-beta.3+1.20.1
 neoforge_curios_version_range=[5.2.0-beta.3+1.20.1,)
 
 # Fabric
 fabric_loader_version=0.14.22
 fabric_api_version=0.89.0+1.20.1
-fabric_mlib_version_range=>=6.1.0
+fabric_mlib_version_range=>=6.1.7
 fabric_trinkets_version=3.7.0
 fabric_cca_version=5.2.0
 
 # Majrusz Library
-mlib_version=1.20.1-6.1.0
+mlib_version=1.20.1-6.1.7
 
 # Publishing
 modrinth_project_id=6roN0iTa
diff --git a/neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.0.jar b/neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.7.jar
similarity index 75%
rename from neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.0.jar
rename to neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.7.jar
index ecfe0d94..b0b0bd9e 100644
Binary files a/neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.0.jar and b/neoforge/libs/majrusz-library-neoforge-1.20.1-6.1.7.jar differ