Symptoms

When the client goes to any Rule and add the "Execute Another Rule" action or click on the 'Select Rule' option, he receives the following error:
"Widget Error unable to get property 'text' of undefined or null reference"
 

Diagnoses

We found that the friendly name of some of the rules went missing and thus causing the error.
 

Resolution

We received a codefix from our development team and it solved their issue.