Can you do some code modifications on your site to check if that solves the issue?
Go to plugin folder/includes/class-query.php
Find alter_orderby_query function, line 741 and right after this:
if (is_admin())
return $query;
if (empty($query))
return $query;
insert this:
$post_types = $query->get('post_type');
// does query contain post type as a string or post types array
if(is_array($post_types))
{
// check if there are defferrnces between the arrays
if((bool)array_diff($post_types, apply_filters('em_event_post_type', array('event'))))
// at least one of the post_types is not an event post type, don't run the query
$run_query = false;
else
// all the post type are of event post type
$run_query = true;
}
else
$run_query = (bool)in_array($post_types, apply_filters('em_event_post_type', array('event')));
// do sorting or not
if(!$run_query)
return $query;