diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/util/Utils.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/util/Utils.kt
index 6758050b..9566b875 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/util/Utils.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/util/Utils.kt
@@ -19,6 +19,12 @@ fun String.sbIntern(): String {
 val JsonElement.asStringOrNull: String?
 	get() = if (isJsonNull) null else asString
 
+val JsonElement.asDoubleOrNull: Double?
+	get() = if (isJsonNull) null else asDouble
+
+val JsonElement.asBooleanOrNull: Boolean?
+	get() = if (isJsonNull) null else asBoolean
+
 val JsonElement.coalesceNull: JsonElement?
 	get() = if (isJsonNull) null else this
 
diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/ProjectileEntity.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/ProjectileEntity.kt
index fee1ab5e..64045023 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/ProjectileEntity.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/world/entities/ProjectileEntity.kt
@@ -29,6 +29,9 @@ import ru.dbotthepony.kstarbound.network.syncher.networkedBoolean
 import ru.dbotthepony.kstarbound.network.syncher.networkedEventCounter
 import ru.dbotthepony.kstarbound.util.AssetPathStack
 import ru.dbotthepony.kstarbound.util.Directives
+import ru.dbotthepony.kstarbound.util.asBooleanOrNull
+import ru.dbotthepony.kstarbound.util.asDoubleOrNull
+import ru.dbotthepony.kstarbound.util.asStringOrNull
 import ru.dbotthepony.kstarbound.util.valueOf
 import java.io.DataInputStream
 import java.io.DataOutputStream
@@ -80,11 +83,11 @@ class ProjectileEntity private constructor(val config: Registry.Entry<Projectile
 	var damageKind = parameters.get("damageKind", config.value.damageKind)
 	var damageType = DamageType.entries.valueOf(parameters.get("damageType", config.value.damageType))
 	var rayCheckToSource = parameters.get("rayCheckToSource", config.value.rayCheckToSource)
-	var damageRepeatGroup = parameters["damageRepeatGroup"]?.asString ?: config.value.damageRepeatGroup
-	var damageRepeatTimeout = parameters["damageRepeatTimeout"]?.asDouble ?: config.value.damageRepeatTimeout
-	var falldown = parameters["falldown"]?.asBoolean ?: config.value.falldown
-	var hydrophobic = parameters["hydrophobic"]?.asBoolean ?: config.value.hydrophobic
-	var onlyHitTerrain = parameters["onlyHitTerrain"]?.asBoolean ?: config.value.onlyHitTerrain
+	var damageRepeatGroup = parameters["damageRepeatGroup"]?.asStringOrNull ?: config.value.damageRepeatGroup
+	var damageRepeatTimeout = parameters["damageRepeatTimeout"]?.asDoubleOrNull ?: config.value.damageRepeatTimeout
+	var falldown = parameters["falldown"]?.asBooleanOrNull ?: config.value.falldown
+	var hydrophobic = parameters["hydrophobic"]?.asBooleanOrNull ?: config.value.hydrophobic
+	var onlyHitTerrain = parameters["onlyHitTerrain"]?.asBooleanOrNull ?: config.value.onlyHitTerrain
 
 	init {
 		if ("damageTeam" in parameters) {
@@ -106,7 +109,7 @@ class ProjectileEntity private constructor(val config: Registry.Entry<Projectile
 		movement.applyParameters(movementParams)
 	}
 
-	var initialSpeed = parameters["speed"]?.asDouble ?: config.value.speed
+	var initialSpeed = parameters["speed"]?.asDoubleOrNull ?: config.value.speed
 
 	private var lastSourceEntityPosition: Vector2d? = null
 	var sourceEntityId: Int = 0