I just put my first-ever client script into production a few hours ago and I've started getting the below error reports. How do I figure out what is going wrong with this script when there's no stack trace or anything?

Account: 12345
Environment: Production
Date & Time: 03/04/2019 12:55 pm
Record Type: Sales Order
Internal ID: 6789
Script: Sales Order Backorder Validation
Type: Client
Function: customscript_ah_so_backorder_validation
Error: JS_EXCEPTION
Error empty response