I set merhing chest setting: 1xN 40x40.
I get an error when trying to combine a 40 by 40 chest

Error while running event WideChests::on_player_selected_area (ID 51)
Given bar value (76801) is too big, the data type allows values from 1 to 65536
stack traceback:
[C]: in function 'set_bar'
WideChests/control_init.lua:82: in function 'move_inventory_bar'
WideChests/scripts/event_handlers/merge_chest.lua:185: in function <WideChests/scripts/event_handlers/merge_chest.lua:174>

Fixed in brand new 5.1.0

The same error. I play with krastorio and 48 base chest size.

The mod Merging Chests (5.1.0) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event WideChests::on_player_selected_area (ID 51)
Given bar value (65537) is too big, the data type allows values from 1 to 65536
stack traceback:
[C]: in function 'set_bar'
WideChests/control_init.lua:82: in function 'move_inventory_bar'
WideChests/scripts/event_handlers/merge_chest.lua:185: in function <WideChests/scripts/event_handlers/merge_chest.lua:174>

Omg, off by one error, fixed in 5.1.1

Given bar value (65537) is too big, the data type allows values from 1 to 65536
look carefully, you lost where the 1 is in the algorithm

oh, sorry, I didn’t see that my mod wasn’t updated. everything works, you're great