diff --git a/game/game.gd b/game/game.gd
index 6465c77..7d03387 100644
--- a/game/game.gd
+++ b/game/game.gd
@@ -41,6 +41,7 @@ func _on_purchase_begin(what: PurchasableItem):
 	store_collector_panel.show()
 	ghost.process_mode = Node.PROCESS_MODE_INHERIT
 	ghost.show()
+	time_spawner_timer.stop()
 
 func _handle_purchase_success(what: PurchasableItem):
 	what.complete_purchase()
@@ -52,6 +53,7 @@ func _on_purchase_cancel(what: PurchasableItem):
 	store_collector_panel.hide()
 	ghost.process_mode = Node.PROCESS_MODE_DISABLED
 	ghost.hide()
+	time_spawner_timer.start()
 
 func _on_purchase_success(what: PurchasableItem):
 	print("[Game] Succedeed purchase of ", what.name, " costing ", what.item_cost_goal, "x ", what.item_cost_type)
@@ -60,6 +62,7 @@ func _on_purchase_success(what: PurchasableItem):
 	store_collector_panel.hide()
 	ghost.process_mode = Node.PROCESS_MODE_DISABLED
 	ghost.hide()
+	time_spawner_timer.start()
 
 func _on_store_collector_collected(_body: RigidBody2D):
 	update_counter_text()
diff --git a/spawner/spawner.gd b/spawner/spawner.gd
index 9a2ca0a..08aba7a 100644
--- a/spawner/spawner.gd
+++ b/spawner/spawner.gd
@@ -52,6 +52,8 @@ func _do_spawn():
 	var overlapping_bodies = get_overlapping_bodies()
 	if len(overlapping_bodies) > overlapping_body_count_limit:
 		return
+	if scene == null:
+		return
 	var instantiated = scene.instantiate()
 	instantiated.global_position = global_position + _select_spawn_position()
 	instantiated.rotation_degrees = _select_spawn_rotation()