diff --git a/Scripts/ConveyerController.gd b/Scripts/ConveyerController.gd
index e7c6fc0..cdb5253 100644
--- a/Scripts/ConveyerController.gd
+++ b/Scripts/ConveyerController.gd
@@ -11,12 +11,12 @@ var can_send = false
 var started = false
 
 func initialise():
-	self.selected
+	self.selected = null
 	self.events = []
 	self.destination = []
 	self.conveyer = []
 	self.conveyerInd = 0
-	self.dragging
+	self.dragging = null
 	self.sendingEnd = false
 	self.can_send = false
 	self.started = false
@@ -25,9 +25,8 @@ func setup(conveyer) -> void:
 	self.conveyer.append(conveyer)
 	self.can_send = false
 	self.sendingEnd = false
-	self.events = []
 	self.started = false
-	
+	# DON'T clear events here boxes add themselves in _ready()
 
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
@@ -41,7 +40,26 @@ func _process(delta: float) -> void:
 	pass
 
 func create_conveyor():
-
+	# SAFETY CHECK for BasicEventFlow (1 conveyor scene)
+	# Allow dynamic creation for MultiSink (3+ conveyor scene)
+	if conveyerInd >= conveyer.size():
+		if conveyer.size() == 0:
+			print("ERROR: No conveyors available!")
+			return
+		
+		# Only allow dynamic creation if we have 3+ conveyors (MultiSink level)
+		if conveyer.size() >= 3:
+			# MultiSink create more conveyors dynamically
+			var new_conveyor = conveyer[0].duplicate()
+			get_tree().current_scene.add_child(new_conveyor)
+			new_conveyor.z_index = -1
+			conveyer.append(new_conveyor)
+			print("Created new conveyor, total: ", conveyer.size())
+		else:
+			# BasicEventFlow stop here to prevent crash
+			print("No more conveyors available (max ", conveyer.size(), ")")
+			return
+	
 	conveyer[conveyerInd].set_point_position(0, selected.get_position())
 	conveyer[conveyerInd].set_point_position(1, destination[conveyerInd])
 	AudioManager.play_construction()