[Plugin: WP-HTML-Compression] PHP Catchable fatal error

Were you attempting to load an empty HTML document?

I just changed the update version code to –
@add_action('get_header', 'wp_html_compression_start', 1);

And now its working fine…

Check it out

If you have a theme that does not call get_header(), such as single page themes, then compression will not occur.

Error no longer displayed in 0.5.1