White Screen of Death

[Tuomas Lindroos]

Hello,

I'm having a major problem with IPS 4. I upgraded from 3.4 and got everything working except theme editing.
When I try to edit a theme I just get a white screen. In error logs I get something like this:

[01-Sep-2015 14:38:26 UTC] PHP Fatal error:  Cannot access static:: when no class scope is active in /forum/system/Theme/Theme.php on line 1212

Any ideas what to do?

[Tuomas Lindroos]

Solved with this: