This is not resolved. We have this issue even WP_DEBUG constant is false.
In file: https://plugins.trac.www.ads-software.com/browser/wp-leads-builder-any-crm/trunk/lib/nusoap/nusoap.php
Remove the last line closing tag ?> (of PHP)
This makes headers already sent issue.
Also to consider after this closing tag, on another line (the last one under it is a whitespace line) – considered to be sent to browser.
Thank you for fixing this.
