Seems to only happen when i use the mod P.U.M.P. to setup the oil field blueprint and Companion Drones mod goes to place them down.

The mod Water As A Resource (0.8.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event WaterAsAResource::on_robot_built_entity (ID 14)
WaterAsAResource/control.lua:1948: attempt to index field 'last_user' (a nil value)
stack traceback:
WaterAsAResource/control.lua:1948: in function <WaterAsAResource/control.lua:1887>

Hello Eroko,

Thanks for raising the issue.

I'll see If I can replicate the issue, and let you know what I find.

Thanks.

Hello,

After a quick test, looks like this is related to just P.U.M.P.

So I'll take a look when I next can into what that mod is specifically doing, and work on the issue.

Ok so this was down to the PUMP mod not specificity the player who created the ghost that was placed.

Simply changed my mod to look directly for the force whom created it instead, which I should have done anyway.

So solved for the next version.