diff --git a/demo/demo/agents/fireball/fireball.gd b/demo/demo/agents/fireball/fireball.gd
index a838bf0..9101514 100644
--- a/demo/demo/agents/fireball/fireball.gd
+++ b/demo/demo/agents/fireball/fireball.gd
@@ -41,6 +41,8 @@ func _physics_process(delta: float) -> void:
 
 
 func _die() -> void:
+	if _is_dead:
+		return
 	_is_dead = true
 	trail.emitting = false
 	root.hide()
diff --git a/demo/demo/agents/ninja_star/ninja_star.gd b/demo/demo/agents/ninja_star/ninja_star.gd
index 6f8ac8c..7821796 100644
--- a/demo/demo/agents/ninja_star/ninja_star.gd
+++ b/demo/demo/agents/ninja_star/ninja_star.gd
@@ -39,6 +39,8 @@ func _physics_process(delta: float) -> void:
 
 
 func _die() -> void:
+	if _is_dead:
+		return
 	_is_dead = true
 	root.hide()
 	collision_shape_2d.set_deferred(&"disabled", true)