Stuck on an issue?

I just installed a fresh instance of WP and the starter.

The home page pulls up no problem but…

For some reason when I click on a post I am getting this error.

Server Error TypeError: Cannot read property ‘length’ of undefined

` 147 | 148 | const { categories, postId } = post;

149 | const category = categories.length && categories[0]; | ^ 150 | let { name, slug } = category; 151 | 152 | return {`

I have not added anything else to the starter (other than the graphql endpoint). I have not added any posts new posts. I added only one additional category for testing.

Is there a step I am missing?

Here is the WP install: http://newtechmachinery.kinsta.cloud/

thanks