My papyrus logfile is full of this error -

[07/15/2013 - 12:00:33AM] error: Cannot request LOS to a None object
stack:
[ (00000014)].Actor.HasLOS() - "" Line ?
[ (000709F6)].WordWallTriggerScript.isLooking() - "WordWallTriggerScript.psc" Line 135
[ (000709F6)].WordWallTriggerScript.OnUpdate() - "WordWallTriggerScript.psc" Line 310

My earliest save has this occuring so I can't go to an earlier save. I'm playing with no DLCs enabled and none of the mods I'm running have anything to do with word walls (apart from USKP).

Is this going to cause future crashing and should I just start fresh?

A bump with new info.

Currently this error is generating 1Mb of logfile every 3 minutes of playing. Also the wordwall in question is Shearpoint.

Would there be some console command I could use to turn off this script?

Skyrim Script Extender (SKSE) (http://skse.silverlock.org/)

Use this with the SKSE, install, go to skyrim>data>SKSE and create "SKSE.ini" and type:

[General]
ClearInvalidRegistrations=1

Save and close.

It will now clean invalid scripts from mods you don't use anymore from your save game. It will take a while and only works as you play, but over time your save will drop.

(Completely safe and yes it does work. At least, no one has reported anything amiss.)