How to show php errors in custom widget

I am developping some custom widgets with siteorigin widget bundle framework, exactly like on this post : see tutorial.

Is it normal that I cannot see the php error when developping my widget script (errors that come from the widget template file)?

The page load until the error appends and then after the page goes blank, and I have no errors on screen or in my log file…

Maybe I am missing something obvious, or maybe I have a conflict with another plugin or my current theme. But I would appreciate if someone could tell me if he has the same behavior and how can I solve it…

Thanks a lot!

PS: My wp debug constant :

define(‘WP_DEBUG’, true);
define(‘SCRIPT_DEBUG’, true);
define(‘WP_DEBUG_DISPLAY’, true);
define(‘WP_DEBUG_LOG’,true);
define(‘SITEORIGIN_PANELS_DEV’, true);