Yeaaaaaa I might have skimmed too hard in a hurry

The error is thrown only sometimes, and a lot of my older blend files suffer from duplicates being made, sometimes with the original mesh ending up with edits from about a dozen undo steps removed.

I've taken to simply saving before exporting so I can circumvent the entire issue for now.

So I've got global undo disabled and it still throws the error:

Python: Traceback (most recent call last):
File "C:\Users\Lilly\AppData\Roaming\Blender Foundation\Blender\4.5\scripts\addons\io_scene_valvesource\export_smd.py", line 260, in execute
if bpy.app.debug_value <= 1: ops.ed.undo()
^^^^^^^^^^^^^
File "C:\Program Files\Blender Foundation\Blender 4.5\4.5\scripts\modules\bpy\ops.py", line 109, in __call__
ret = _op_call(self.idname_py(), kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Operator bpy.ops.ed.undo.poll() failed, context is incorrect

@TheanineHD Thank you! That's a good find! I'll check (if I can remember next time, heh) soon once I get around to it!

I'll get on capturing the full log soon. The blend file however, this has been happening since Blender 4.0 I believe, in every single file that I create new or carry over from older Blender versions. And my blend files are typically huge so they're difficult to send over.

Maybe this will work, I don't have the time to reproduce it again right now.

https://pasteboard.co/JDJXXAQ1FFjd.jpg

https://cdn.discordapp.com/attachments/1019720419495903308/1435613256550060264/image.png?ex=690c9a88&is=690b4908&hm=1f3afa184f50a3434dcd56827b75b9ec604ee54727aa9ad1ae2c2a28b1482581

This also happens when trying to use SourceIO side by side with SourceTools, blocking function of that add-on entirely.