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"Cannot read property '_configs' of undefined JS error



JavaScript error occurs when closing a tab and the system hangs.

Error Messages

JavaScript error on the Developer toolbar console: 

Cannot read property '_configs' of undefined

Steps to Reproduce

  1. From the Navigation rule which invokes the Create Work. New tabs open.
  2. Launch a few tabs. If the tabs are closed from the last (last in first out (LIFO)), error does not occur.
  3. Close the tabs from the beginning. Close the first tab and then the second tab. JavaScript error occurs.

Root Cause

A defect in Pegasystems’ code or rules.
Error was related to registering on an active tab. The issue occurred because a null check was not present for the active tab.


Apply HFix-53197.
Suggest Edit

Published August 15, 2019 - Updated October 8, 2020

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