[4.5.1] Slate Crash

editor crashed when I tried to close one of tabs.

Here is error message: http://pastebin.com/xHzYp8NV

Hey Benjiko99,

Thank you for your report. We have assigned this issue to a member of our support staff, and they will begin investigation as soon as possible. If we are unable to reproduce issue, or we need additional information, our staff member will comment here with additional questions. Otherwise, we will post an ‘Answer’ once we have logged issue in our bug database or we have a solution for it.

In meantime, please be sure to review our suggestions for how to report a bug, and feel free to edit your post if you have additional information to provide:

Please and attach crash log and dump file for your project after a crash.

Thanks!