diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/AbstractEnormousPlacement.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/AbstractEnormousPlacement.kt
index defd2c7c4..750d6263b 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/AbstractEnormousPlacement.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/AbstractEnormousPlacement.kt
@@ -3,6 +3,7 @@ package ru.dbotthepony.mc.otm.worldgen.placement
 import com.github.benmanes.caffeine.cache.Caffeine
 import com.github.benmanes.caffeine.cache.Scheduler
 import com.mojang.serialization.Codec
+import com.mojang.serialization.DataResult
 import com.mojang.serialization.MapCodec
 import com.mojang.serialization.codecs.RecordCodecBuilder
 import it.unimi.dsi.fastutil.HashCommon
@@ -102,7 +103,7 @@ abstract class AbstractEnormousPlacement(val parameters: Parameters) : Placement
 		val PARAMETERS_CODEC: MapCodec<Parameters> = RecordCodecBuilder.mapCodec {
 			it.group(
 				Codec.INT.minRange(0).fieldOf("chunk_scan_range").forGetter(Parameters::chunkScanRange),
-				Codec.LONG.fieldOf("seed_mix").forGetter(Parameters::seedMix),
+				Codec.LONG.validate { if (it == 0L) DataResult.error { "Due to technical limitations, seed_mix can not be zero" } else DataResult.success(it) }.fieldOf("seed_mix").forGetter(Parameters::seedMix),
 				CODEC.listOf().fieldOf("placement").forGetter(Parameters::placementModifiers),
 			).apply(it, ::Parameters)
 		}