TDM Data Painter Intermittent Field Validation Error: unable to get property 'data' of undefined or null reference.
If field is re-validated no error occurs. Error occurred after applying patch v4.9.35.
Release : 4.9
Component : CA Test Data Manager - TDM Web Portal
The cause was related to a change made in Portal related to parallel validation of expressions.
It appears this odd behavior is specifically related to IE and Microsoft Edge browsers, and not seen in Chrome, Firefox, and the other browsers tested.
Open a support case for patch TDMWeb-184.108.40.206 or later for TDM Portal 4.9.