Django Rest Framework GUI Blank on POST/PUT/DELETE

I’m in the API section of Mosh’s Ultimate Django Part 2, and every time I Put/Patch/Post/Delete a ProductDetail or CollectionDetail, the screen goes blank. The terminal shows successful operations, and the database is correctly updated, but the page just goes white (including removing the debug toolbar). Curiously the square grid image is still displayed on the page. Any thoughts on what could be going wrong?

Oh! I also just found out this is only happening in Safari. Just tried the same operation in Chrome and it’s working as expected.