scene/main/node.cpp:2006 - Parameter "common_parent" is null.

[Morokiane]

Godot version

4.2.Beta 1

System information

Windows 11

Issue description

When saving all scenes "scene/main/node.cpp:2006 - Parameter "common_parent" is null." will appear 6 times in Output.

Steps to reproduce

Save all Scenes or run the game

Minimal reproduction project

n/a

[Ciapas-Linux]

Hi
Under Linux Debian it is the same:
scene/main/node.cpp:2006 - Parameter "common_parent" is null.

[wilfredjonathanjames]

MacOS 12.3, 4.2-beta1 as well. Happens once or twice when running project (Cmd+B).

[wenqiangwang]

Godot 4.1.2 has the same issue but the error message is instead "scene/main/node.cpp:1994 - Parameter "common_parent" is null." - only the line number is different, which seems the same line in Node::get_path_to.

The repro is in saving a branch as a scene like below:

Create scene structure:

• Node3D
  • Node3D
    • AnimationPlayer

Add a script for the middle Node3D, within which has "@export var animation_player : AnimationPlayer". No other code is needed.

Click on the middle Node3D node and assign its Animation Player property in the inspector to its child (Animation Player).
PLEASE NOTE that, without this step, it won't repro!

Now right click on the middle Node3D node and click "Save Branch as Scene", hit the OK button in the popup dialog and it repros.

Please see attached zip file for the scene and script file.

repro.zip

[theraot]

I'm getting scene/main/node.cpp:2006 - Parameter "common_parent" is null. in Godot 4.2.beta2 when using "Save All Scenes" with multiple scenes open. Seems to appear once per AnimationPlayer in scenes others than the currently edited one.

[mikeklubnika]

"scene/main/node.cpp:1988 - Parameter "common_parent" is null."
I got this every single time I saved (4.1.1 stable). Very confusing, but managed to re-create it:

1. @export var thing : Node3D, to get a field in the inspector.
2. add a Node3D to the field as you do.
3. delete the Node3D from the scene.
4. the field in the inspector is now empty, but the engine seems confused because if it were empty it would say 'Assign ...', instead there is simply a blank rectangle and the 'Clear' button is still visible on the right.
5. saving the scene now throws the same error message mentioned before, until the field is actually cleared.

[theraot]

@mikeklubnika Please mention the version of Godot you were using.

[paxer]

4.2.Beta 3, macOS 14, happens when running a scene or a project

[KoBeWi]

Getting the same error in 4.2 beta4. It appears randomly when running the project (so all scenes are saved), seems to depend on a combination of open scenes/scripts. I can't reproduce it reliably, even with the steps described above.

[YuriSizov]

Removing regression because there are confirmations of this from 4.1.

[KoBeWi]

Ok, got a stack trace:

Node::get_path_to(const Node * p_node, bool p_use_unique_path) Line 2007 (c:\godot_source\scene\main\node.cpp:2007)
AnimationMixer::reset() Line 1996 (c:\godot_source\scene\animation\animation_mixer.cpp:1996)
AnimationMixer::apply_reset(bool p_user_initiated) Line 1979 (c:\godot_source\scene\animation\animation_mixer.cpp:1979)
_reset_animation_mixers(Node * p_node, List<Pair<AnimationMixer *,Ref<AnimatedValuesBackup>>,DefaultAllocator> * r_anim_backups) Line 1737 (c:\godot_source\editor\editor_node.cpp:1737)
_reset_animation_mixers(Node * p_node, List<Pair<AnimationMixer *,Ref<AnimatedValuesBackup>>,DefaultAllocator> * r_anim_backups) Line 1745 (c:\godot_source\editor\editor_node.cpp:1745)
EditorNode::_save_scene(String p_file, int idx) Line 1766 (c:\godot_source\editor\editor_node.cpp:1766)
EditorNode::_save_all_scenes() Line 1911 (c:\godot_source\editor\editor_node.cpp:1911)
EditorNode::_menu_option_confirm(int p_option, bool p_confirmed) Line 2662 (c:\godot_source\editor\editor_node.cpp:2662)
EditorNode::_menu_option(int p_option) Line 1371 (c:\godot_source\editor\editor_node.cpp:1371)
EditorNode::try_autosave() Line 1868 (c:\godot_source\editor\editor_node.cpp:1868)
EditorRunBar::_run_scene(const String & p_scene_path) Line 230 (c:\godot_source\editor\gui\editor_run_bar.cpp:230)
EditorRunBar::play_main_scene(bool p_from_native) Line 271 (c:\godot_source\editor\gui\editor_run_bar.cpp:271)
call_with_variant_args_helper<EditorRunBar,bool,0>(EditorRunBar * p_instance, void(EditorRunBar::*)(bool) p_method, const Variant * * p_args, Callable::CallError & r_error, IndexSequence<0> __formal) Line 308 (c:\godot_source\core\variant\binder_common.h:308)
call_with_variant_args<EditorRunBar,bool>(EditorRunBar * p_instance, void(EditorRunBar::*)(bool) p_method, const Variant * * p_args, int p_argcount, Callable::CallError & r_error) Line 418 (c:\godot_source\core\variant\binder_common.h:418)
CallableCustomMethodPointer<EditorRunBar,bool>::call(const Variant * * p_arguments, int p_argcount, Variant & r_return_value, Callable::CallError & r_call_error) Line 105 (c:\godot_source\core\object\callable_method_pointer.h:105)
Callable::callp(const Variant * * p_arguments, int p_argcount, Variant & r_return_value, Callable::CallError & r_call_error) Line 58 (c:\godot_source\core\variant\callable.cpp:58)
CallableCustomBind::call(const Variant * * p_arguments, int p_argcount, Variant & r_return_value, Callable::CallError & r_call_error) Line 145 (c:\godot_source\core\variant\callable_bind.cpp:145)
Callable::callp(const Variant * * p_arguments, int p_argcount, Variant & r_return_value, Callable::CallError & r_call_error) Line 58 (c:\godot_source\core\variant\callable.cpp:58)
Object::emit_signalp(const StringName & p_name, const Variant * * p_args, int p_argcount) Line 1127 (c:\godot_source\core\object\object.cpp:1127)
Node::emit_signalp(const StringName & p_name, const Variant * * p_args, int p_argcount) Line 3609 (c:\godot_source\scene\main\node.cpp:3609)

Seems to be caused by RESET track taking effect in another scene.