custom_utils.php file is not able to get current user information

I created custom util file to create function and used language file to call that function.

Only problem I'm having is that it's not getting any information regarding current user. When I tried to print current user array to log file it shows like below:

07/06/16 16:28:54 [4504][-none-][FATAL]

As far as I know, it's not getting any userID as it shows [-none-] in log file.

Is this the Sugar Bug or I'm doing something wrong?