Given inventory does not have filters.
stack traceback:
Kux-SmartLinkedChests/control.lua:34: in function <Kux-SmartLinkedChests/control.lua:32>
[C]: in function 'get_filter'
Kux-SmartLinkedChests/modules/Chest.lua:269: in function 'getFilterFromChest'
Kux-SmartLinkedChests/modules/FilterFromSource.lua:124: in function 'endAdd'
Kux-SmartLinkedChests/modules/FilterFromSource.lua:108: in function 'set'
Kux-SmartLinkedChests/control.lua:31: in function <Kux-SmartLinkedChests/control.lua:29>
[C]: in function 'xpcall'
Kux-SmartLinkedChests/control.lua:29: in function 'fnc'
Kux-CoreLib/lib/EventDistributor.lua:164: in function <Kux-CoreLib/lib/EventDistributor.lua:159>

Kux-SmartLinkedChests v3.0.17
Kux-CoreLib v3.14.1

Steps to repoduce:
...describe which steps you have done before...

i need more information

Steps to repoduce:
...describe which steps you have done before...

it's not there for nothing ;-)

has a mod changed the chests?

When placing a surface smart chest and using an inserter to transfer items from the smart chest into an iron chest, closing the GUI of the iron chest and reopening it causes the error to appear. No changes have been made to the mod settings. Will be checking through an early save to see if this still happens with an earlyer save.

Not having the issue in a new earlier saved game. Was possibly an issue with existing save

the error only occurs if you insert properties from incompatible chest (Shift+LeftClick) (its a paste_alt event)
I have added an additional check