There're 2 small bugs [Fix]

In version 12.08 with wp_debug turned on I get the error notice:

Notice: Use of undefined constant lj_plugin_actions – assumed ‘lj_plugin_actions’

You forgot to add quotes when checking if the functions exist. Here are the fixed lines.

if(!function_exists('lj_plugin_actions'))

and 

if(!function_exists('lj_custom_admin_menus'))

https://www.ads-software.com/plugins/custom-adminbar-menus/