Search broken due to invalid json format

After my last blog entry (about testing windows subsystem linux), my search screen has been broken.

Under the hood there is a javascript error:

Going to /assets/js/search.js, There is a link /assets/js/search-data.json to json data containing my blog posts.
Looking at this data (line 512 column 5777 as mentionned in error message), I have this content:

I guess the bad char is ‘\00’.
Maybe there is a way to escape this character when creating the json file?

Meanwhile I will delete this output cell in my notebook.