Hummingbird dashboard and GZIP compression pages don't load

If you go either to Hummingbird Dashboard or GZIP compression the page will show 500 error.

If plugins are deactivated and default WP theme is used it will not show 500 error but the page will not load still, it will show like this:

Tried re-installing the plugin but it made no difference.

Debug.log is attached but it doesn't seem like it has anything pointing to the cause.