Troubleshooting: Postman Pre-Request Script Fails with TypeError (Cannot Read Properties of Undefined)

Version Affected: All
 
 

Overview

When using the Postman collections provided by SecureAuth to call the SecureAuth API, a GET request can fail with the following error:

There was an error in evaluating the Pre-request Script:TypeError: Cannot read properties of undefined (reading 'length')

Cause

The active Postman environment is missing one or more variables that the pre-request script expects — for example, AppID or AppKey. 

Resolution:

Check the active Postman environment for missing variables. If the environment was recently modified, confirm a variable wasn't accidentally removed that the pre-request script still needs.


 

SecureAuth Knowledge Base Articles provide information based on specific use cases and may not apply to all appliances or configurations. Be advised that these instructions could cause harm to the environment if not followed correctly or if they do not apply to the current use case.

Customers are responsible for their own due diligence prior to utilizing this information and agree that SecureAuth is not liable for any issues caused by misconfiguration directly or indirectly related to SecureAuth products.