"Condition !is_inside_tree() is true " after Node collision with Area

Question

Hi, I am using Godot Engine for a uni assignment.

In an Area, which has the area_enter signal connected, I try to queue_free() any node after a collision with my Area.

However, an error "Condition !isinsidetree() is true " shows up in the debugger after each node collision with my Area.

The sample code is as below :

func my_area_on_area_enter(area):
    # check if the parent of the area (the node) is inside tree
    print("Area in tree : ", area.get_parent().is_inside_tree())
    # delete the node (which has an extra area for collision purpose)
    area.get_parent().queue_free()

The Output terminal shows that for each node colliding with my Area, all of them are inside the scene tree but the error of "Condition !isinsidetree() is true " still appears nevertheless.

I have been googling and checked from godot github repo but I found no solution.

I appreciate greatly if anyone shares possible solution.

The godot version I am using is v2.1.3

Thanks !

Comments

Could you, please, provide your scene tree structure?

Answer 1

This kind of thing can happen when youqueue_free()an object during collision checks or a signal callback.

Try changing the line to:

area.get_parent().call_deferred("queue_free")

This will ensure that the body is freed on the next frame, after area_enter processing has completed.