Pro version generating unlimited php error

Pro banner is no more updated. Random banner pro version is consistently generating PHP errors and consuming server memory. This is the example of error from logs:
_start(): Cannot start session when headers already sent in /home/**/public_html/**/wp-content/plugins/random-banner/random-banner-pro.php on line 59
PHP Warning: session_start(): Cannot start session when headers already sent in /home/**/public_html/**/wp-content/plugins/random-banner/include/function/function.php on line 769