diff --git a/src/main/kotlin/com/bytedice/bde_particles/DisplayEntity.kt b/src/main/kotlin/com/bytedice/bde_particles/DisplayEntity.kt
index 7598534..810feaf 100644
--- a/src/main/kotlin/com/bytedice/bde_particles/DisplayEntity.kt
+++ b/src/main/kotlin/com/bytedice/bde_particles/DisplayEntity.kt
@@ -8,14 +8,14 @@ import net.minecraft.nbt.NbtList
 import net.minecraft.nbt.NbtString
 import net.minecraft.server.world.ServerWorld
 
-class DisplayEntity(val properties: DisplayEntityProperties?) {
+class DisplayEntity(var properties: DisplayEntityProperties?) {
   private var hasSpawned = false
   private var entity: BlockDisplayEntity? = null
 
   fun spawn(world: ServerWorld) : BlockDisplayEntity? {
     if (hasSpawned || properties == null) { return null }
 
-    val e = updateProperties(world, properties)
+    val e = updateProperties(world, properties!!)
     world.spawnEntity(e)
 
     this.hasSpawned = true
@@ -72,6 +72,8 @@ class DisplayEntity(val properties: DisplayEntityProperties?) {
     e.refreshPositionAndAngles(properties.pos.x, properties.pos.y, properties.pos.z, properties.rot.x, properties.rot.y)
 
     entity = e
+    this.properties = properties
+
     return e
   }
 
diff --git a/src/main/kotlin/com/bytedice/bde_particles/particle/Particle.kt b/src/main/kotlin/com/bytedice/bde_particles/particle/Particle.kt
index f9f5e26..b1e367b 100644
--- a/src/main/kotlin/com/bytedice/bde_particles/particle/Particle.kt
+++ b/src/main/kotlin/com/bytedice/bde_particles/particle/Particle.kt
@@ -65,7 +65,7 @@ class Particle(private val particleParams: ParticleParams) {
 
     val properties = blockDisplay?.properties ?: return
 
-    val newProperties = calculateNewProperties(properties, particleParams)
+    val newProperties = calculateNewProperties()
 
     blockDisplay?.updateProperties(world, newProperties)
 
@@ -75,14 +75,14 @@ class Particle(private val particleParams: ParticleParams) {
   }
 
 
-  private fun calculateNewProperties(propetries: DisplayEntityProperties, params: ParticleParams) : DisplayEntityProperties {
+  private fun calculateNewProperties() : DisplayEntityProperties {
     val newBlockIdx = round(lerp(
       0.0f,
-      params.blockCurve.lastIndex.toFloat(),
-      (timeAlive.toFloat() / params.lifeTime.toFloat()).coerceIn(0.0f, 1.0f)
+      particleParams.blockCurve.lastIndex.toFloat(),
+      (timeAlive.toFloat() / particleParams.lifeTime.toFloat()).coerceIn(0.0f, 1.0f)
     )).toInt()
 
-    val newBlock = params.blockCurve[newBlockIdx]
+    val newBlock = particleParams.blockCurve[newBlockIdx]
 
 
     val newProperties = DisplayEntityProperties(