Division by zero error when using drupal_execute() - programmatically creating a node

I'm getting the following warning when creating a node containing a computed field through drupal_execute().

warning: Division by zero in CUSTOMPATH\sites\all\modules\computed_field\computed_field.module(161) : eval()'d code on line 1.

Mathematically, this makes sense since there aren't any values in the remaining fields yet, but it is bothersome to see this as a warning when I use drupal_execute().