Minecolonies version

Version: 0.11.937-ALPHA

Expected behavior

No crash

Actual behaviour

My world is in a state of defending a barbarian invation, and the game crashes every time I load that save.
Reading the crash log it seems to happen becouse a delivery man get killed by a barbarian and the request system tryes to reasign active requests or something like that.

Steps to reproduce the problem

Hard to say for sure. Kill a delivery person with active requests?

Logs: Latest.log and crashlog at https://gist.github.com/

https://gist.github.com/SirSmuggler/4d051a012495f23e0151d8eead6c56f0

I'll add it to my PR too.