**Problem** When Pathauto is installed, publishing a new canvas_page that has no URL alias returns a 500 from `POST /canvas/api/v0/auto-saves/publish`: `AssertionError: assert($pathauto_item instanceof PathautoItem) in assert() (line 127 of modules/contrib/canvas/src/Hook/PageHooks.php)` Pages that already have a URL alias publish without error. **Steps to reproduce** 1. Install Canvas 1.7.1 and Pathauto on Drupal 11.4. 2. Create a new page in the Canvas UI. Do not set a URL alias. 3. Click Publish. The request fails with a 500 and the error above.