When pressing 'upgrade' button in GUI, upgrade options should pop up as with other buildings.
Actual behaviour
Crash to desktop.
Steps to reproduce the problem
Have a wooden smeltery at level 3.
Right click its chest.
Click 'upgrade building'.
This used to work until 11 April or so; I think it may have broken by one of fa6f474dd28a90f187261591203c2d92a36b6f11, a701bb0ccca02a98c43206ae45f1dd636c7d4f1b or 3eeaa7326a9ae58f2bfd60833c13e4b09a38abc6.
Minecolonies version
version 0.8.8133
Expected behavior
Actual behaviour
Steps to reproduce the problem
This used to work until 11 April or so; I think it may have broken by one of fa6f474dd28a90f187261591203c2d92a36b6f11, a701bb0ccca02a98c43206ae45f1dd636c7d4f1b or 3eeaa7326a9ae58f2bfd60833c13e4b09a38abc6.
Crash report: