Hello there!
This mod is really useful, i love it. But lately, i often get an error and the game crash. Here it is :

"The mod Mining patch planner (1.2.9) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event mining-patch-planner::on_tick (ID 0)
mining-patch-planner/layouts/logistics.lua:27: attempt to index field 'related_underground_belt' (a nil value)
stack traceback:
mining-patch-planner/layouts/logistics.lua:27: in function '?'
mining-patch-planner/layouts/base.lua:62: in function 'tick'
mining-patch-planner/control.lua:27: in function <mining-patch-planner/control.lua:17>"

Is there a conflict with another mod?

A transport belt prototype from another mod is missing a related_underground_belt definition.
Logistics layout doesn't use belts so it shouldn't have been a problem in the first place, oops. Will be fixed in 1.2.10.

So quick! Thank you!