Issue with Impreza theme posts causing export to fail

As reported by a user:

> I followed your advice and changed the post to draft, failed still but this time on a different post.
> When I disabled that second post, the process was completed!
>
> Here is what I have installed
> Theme:
>
> Impreza (from Themeforest.net)
>
>
> Active Plugins:
>
> Asset CleanUp Pro: Page Speed Booster By Gabriel Livan
> Composium - WP Bakery Page Builder Extensions Addon By Tekanewa Scripts by Kraut Coding
> Enable jQuery Migrate Helper By The WordPress Team
> Essential Grid By ThemePunch
> GAinWP Google Analytics Integration for WordPress By IntelligenceWP
> GDPR Cookie Consent By WebToffee
> MultiSite Clone Duplicator By Julien OGER
> Static HTML Output (the windows version by you)
> Templatera By WPBakery
> UberMenu - Conditionals Extension By Chris Mavricos, SevenSpark
> UberMenu - Icons Extension By Chris Mavricos, SevenSpark
> UberMenu - Sticky Menu Extension By Chris Mavricos, SevenSpark
> UberMenu 3 - The Ultimate WordPress Mega Menu By Chris Mavricos, SevenSpark
> Ultimate Addons for WPBakery Page Builder By Brainstorm Force
> UpSolution Core By UpSolution
> VC Particles Background By Boom-Apps
> White Label Branding for WordPress Multisite By Alberto Lau (RightHere LLC
> WP Rocket By WP Media
> WP-Sweep By Lester 'GaMerZ' Chan
> WPBakery Page Builder By Michael M - WPBakery.com
> Yoast SEO Premium By Team Yoast
> Yoast SEO: News By Team Yoast
> Yoast SEO: Video By Team Yoast
>
> These are all licensed or free from the WP repository.
> So I changed those to posts back to published and tried crawling again while disabling plugins one by one.
> Any individual plugin deactivated from the above list if my posts were published and not draft, the crawl failed.
>
> So I switched the theme to the standard WordPress theme with those posts published,
> the crawl was successful!
>
> So it looks like the theme is doing something to cause your crawl to fail on only the posts.