Fusion crashes when using threading

[a.wendler]

My add-in runs in the background and receives messages from an external second program. Therefore a thread is created which constantly listens and in the event of a new message runs Fusion360-commands.

Unfortunately Fusion crashes when it has to interact with the UI for example if it has to create a new document.

Here an example:

import adsk.core, adsk.fusion, adsk.cam, math, threading

def run(context😞

    thread = threading.Thread(target=CreateNewDocument)

    thread.start()

def CreateNewDocument():

    app = adsk.core.Application.get()

    doc = app.documents.add(adsk.core.DocumentTypes.FusionDesignDocumentType)

Is there a way to interact with the UI within the thread?

[KrisKaplan · Accepted solution]

You can use a CustomEvent to post a custom event from your background thread, to your main/UI thread custom event handler to perform actions that are limited to the UI thread.

Kris