Server Internal error 500 on dynamic css file

Hi,

Since the last update, I get a 500 error for file:
500 Internal Server Error – https://easy-bootstrap-shortcodes/styles/ebs_dynamic_css.php?ver=4.2.2″

I check my logs and get this error:

[Mon May 11 18:06:47 2015] [warn] [client 82.66.81.230] mod_fcgid: stderr: PHP Fatal error: Call to undefined function ebs_session_start() in /***********/wp-content/plugins/easy-bootstrap-shortcodes/styles/ebs_dynamic_css.php on line 4, referer: https://**********/

If I switch from:

if(!session_id())
    ebs_session_start();

to:

if(!session_id())
    session_start();

No more error.

Is ebs_session_start() really necessary?

Chers,
Improvedline

https://www.ads-software.com/plugins/easy-bootstrap-shortcodes/