Crash, 2.2.9

[Muaddib-1]

Crash on opening buy box. Space age

The mod Black Market 2 (2.2.9) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event BlackMarket2::on_tick (ID 0)
'index': real number expected got nil.
stack traceback:
[C]: in function '__newindex'
BlackMarket2/control.lua:551: in function 'add_order'
BlackMarket2/control.lua:558: in function 'update_menu_trader'
BlackMarket2/control.lua:2309: in function <BlackMarket2/control.lua:2242>