Got this error message after updating today.

The mod Treez (Base Game) (1.20.13) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event treez-base-game::on_nth_tick(10)
treez-base-game/control/queue.lua:391: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
treez-base-game/control/queue.lua:391: in function <treez-base-game/control/queue.lua:387>

1.20.1 was a complete re-write of the backend. Does disabling the mod, loading and playing for a bit, saving and then re-enabling the mod help?

Sorry, I just saw this response. I'll try that.

Looks like I am getting the same error. This is the first time I installed this mod. Does it need to be installed on a new save?
I added it to an existing save.

The mod Treez (Base Game) (1.20.25) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event treez-base-game::on_nth_tick(10)
treez-base-game/control/queue.lua:401: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
treez-base-game/control/queue.lua:401: in function <treez-base-game/control/queue.lua:397>