I got a LUA crash because a nil value.
I think it happend if you trigger the transfert between two platform with nothing on it ^^

The mod Transport rings (0.1.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event transport-ring-teleporter::on_tick (ID 0)
The mod Configurable Valves (0.1.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event configurable-valves::on_entity_cloned (ID 132)
configurable-valves/control.lua:204: attempt to index local 'entity' (a nil value)
stack traceback:
configurable-valves/control.lua:204: in function <configurable-valves/control.lua:202>
stack traceback:
[C]: in function 'clone'
transport-ring-teleporter/Teleporting.lua:7: in function 'teleport_entity'
transport-ring-teleporter/Teleporting.lua:102: in function 'ring_teleport'
transport-ring-teleporter/control.lua:231: in function 'func'
transport-ring-teleporter/util.lua:67: in function 'Execute'
transport-ring-teleporter/control.lua:396: in function <transport-ring-teleporter/control.lua:389>

Oh maybe not... I just see it's maybe a mod conflict :/

It seems to be a bug from the mod "Configurable Valves" you have installed, that is triggered when attempting to teleport some entities.