diff --git a/build.gradle b/build.gradle
index 0f975a40..9d232758 100644
--- a/build.gradle
+++ b/build.gradle
@@ -65,6 +65,7 @@ def useApi(String dep) {
 
 processResources {
 	inputs.property "version", project.version
+	duplicatesStrategy = 'EXCLUDE'
 
 	from(sourceSets.main.resources.srcDirs) {
 		include "fabric.mod.json"
diff --git a/src/main/java/ru/bclib/api/BiomeAPI.java b/src/main/java/ru/bclib/api/BiomeAPI.java
index ef927ef8..0a1cb7b5 100644
--- a/src/main/java/ru/bclib/api/BiomeAPI.java
+++ b/src/main/java/ru/bclib/api/BiomeAPI.java
@@ -91,6 +91,9 @@ public class BiomeAPI {
 	 * @return {@link BCLBiome} or {@code BiomeAPI.EMPTY_BIOME}.
 	 */
 	public static BCLBiome getFromBiome(Biome biome) {
+		if (biomeRegistry == null) {
+			return EMPTY_BIOME;
+		}
 		return ID_MAP.getOrDefault(biomeRegistry.getKey(biome), EMPTY_BIOME);
 	}
 	
diff --git a/src/main/java/ru/bclib/blocks/BaseSlabBlock.java b/src/main/java/ru/bclib/blocks/BaseSlabBlock.java
index 49a4af52..73c2e109 100644
--- a/src/main/java/ru/bclib/blocks/BaseSlabBlock.java
+++ b/src/main/java/ru/bclib/blocks/BaseSlabBlock.java
@@ -50,7 +50,12 @@ public class BaseSlabBlock extends SlabBlock implements BlockModelProvider {
 	@Environment(EnvType.CLIENT)
 	public @Nullable BlockModel getBlockModel(ResourceLocation blockId, BlockState blockState) {
 		ResourceLocation parentId = Registry.BLOCK.getKey(parent);
-		Optional<String> pattern = PatternsHelper.createJson(BasePatterns.BLOCK_SLAB, parentId);
+		Optional<String> pattern;
+		if (blockState.getValue(TYPE) == SlabType.DOUBLE) {
+			pattern = PatternsHelper.createBlockSimple(parentId);
+		} else {
+			pattern = PatternsHelper.createJson(BasePatterns.BLOCK_SLAB, parentId);
+		}
 		return ModelsHelper.fromPattern(pattern);
 	}
 
diff --git a/src/main/java/ru/bclib/mixin/common/ServerLevelMixin.java b/src/main/java/ru/bclib/mixin/common/ServerLevelMixin.java
index bf0fa156..ef881e4d 100644
--- a/src/main/java/ru/bclib/mixin/common/ServerLevelMixin.java
+++ b/src/main/java/ru/bclib/mixin/common/ServerLevelMixin.java
@@ -22,6 +22,7 @@ import net.minecraft.world.level.dimension.DimensionType;
 import net.minecraft.world.level.storage.LevelStorageSource;
 import net.minecraft.world.level.storage.ServerLevelData;
 import net.minecraft.world.level.storage.WritableLevelData;
+import ru.bclib.api.BiomeAPI;
 import ru.bclib.api.DataFixerAPI;
 import ru.bclib.api.WorldDataAPI;
 
@@ -35,6 +36,8 @@ public abstract class ServerLevelMixin extends Level {
 	
 	@Inject(method = "<init>*", at = @At("TAIL"))
 	private void bcl_onServerWorldInit(MinecraftServer server, Executor workerExecutor, LevelStorageSource.LevelStorageAccess session, ServerLevelData properties, ResourceKey<Level> registryKey, DimensionType dimensionType, ChunkProgressListener worldGenerationProgressListener, ChunkGenerator chunkGenerator, boolean debugWorld, long l, List<CustomSpawner> list, boolean bl, CallbackInfo info) {
+		BiomeAPI.initRegistry(server);
+		
 		if (bcl_lastWorld != null && bcl_lastWorld.equals(session.getLevelId())) {
 			return;
 		}