I have recently upgraded from 1.3.8a to 1.3.9h and I am sorting out a few bugs, most of which I now have under control...but this one is confusing me...during checkout with a free shipping module, the following error displays

WARNING: Could not locate language file: includes/languages/english/modules/order_total/ot_insurance.php

I have not used an insurance module before and the error message is correct in there isnt an ot_insurance.php language file...do I need it to make this error go away or is there a way for zc to recognise that it is not required?

any help is appreciated :)