AttributeError: 'ShaderNodeTree' object has no attribute 'outputs'

[DGriffin91]

Describe the bug
When trying to export the poly haven Hidden Alley scene from blender 4.2 I get the error:

File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\addons_core\io_scene_gltf2\blender\exp\material\gltf2_blender_search_node_tree.py", line 904, in check_if_is_linked_to_active_output
    sockets = group_path[-1].outputs
              ^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'ShaderNodeTree' object has no attribute 'outputs'

To Reproduce
Steps to reproduce the behavior

1. Download the blend file from https://blog.polyhaven.com/hidden-alley/
2. Export as gltf
3. See error in console

Expected behavior
For the exporter to not crash.

.blend file
https://dl.polyhaven.org/file/ph-assets/Scenes/hidden_alley.zip

Version

• OS: Windows 10
• Blender Version 4.2

[julienduroure]

Confirmed.
Node tree Mesh with issue : Floor_main

[julienduroure]

Here is in attachment the minimal file that show the issue (well, the original file was 1.4 Go .... !)
Looks like maybe an issue in Blender file itself, as if you enter node group, remove the BSDF/BSDF link, and add it again : No more crash...
minimal_bug_shader.blend.zip

Investigation in progress

[julienduroure]

Investigation progress:
We have an issue on our code, when a socket is linked to 2 output socket of an output group

Unplug/plug again solve the issue because it changes the link order of the socket, and now the "correct" socket goes first, before the second one