A problem with a attribute which is declared as "private static" during debugging

Hello,

I've a class with a attribute:

private static $reserved = array('services' => 1, 'factories' => 1, 'parameters' => 1);

Unfortunately, the debugging process cannot able to parse this line of code in my class. PhPStorm just display "Collecting data..." in the Debugger panel and my apache server was restarted. I don't know what is happening. I'm using a XAMPP server.

Where is a problem? Could anyone help me?


I apologize for my English.