Crash when sorting during a TSM scan with Bagnon 9.0.1-1.13.5

[Pierre-Sassoulas]

The stack trace is the following:

Message: Interface\AddOns\Combuctor\common\api\sorting.lua:177: attempt to compare number with nil
Time: Thu Sep 24 20:47:23 2020
Count: 1
Stack: Interface\AddOns\Combuctor\common\api\sorting.lua:177: attempt to compare number with nil
[C]: ?
Interface\AddOns\Combuctor\common\api\sorting.lua:177: in function <Interface\AddOns\Combuctor\common\api\sorting.lua:174>
[C]: in function `sort'
Interface\AddOns\Combuctor\common\api\sorting.lua:156: in function `GetOrder'
Interface\AddOns\Combuctor\common\api\sorting.lua:67: in function `Iterate'
Interface\AddOns\Combuctor\common\api\sorting.lua:35: in function `Run'
Interface\AddOns\Combuctor\common\api\sorting.lua:29: in function `Start'
Interface\AddOns\Combuctor\common\classes\frame.lua:93: in function <Interface\AddOns\Combuctor\common\classes\frame.lua:92>
(tail call): ?
...erface\AddOns\Combuctor\common\classes\inventory.lua:48: in function `SortItems'
...rface\AddOns\Combuctor\common\classes\sortButton.lua:39: in function <...rface\AddOns\Combuctor\common\classes\sortButton.lua:30>