https://community.appian.com/discussions/f/general/18626/error-in-activity-taskHi Everyone, Good day! Can you please help to resolve this issue. An error occurred while evaluating expression: deactivatedUserNames&amp;:pv!inactiveUserDetails.appianUsername (Invalid index: Cannot index property &#39;appianUsername&#39; of type Text intoen-USTelligent Community 12https://community.appian.com/thread/73334?ContentTypeID=1Wed, 15 Apr 2020 11:18:22 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:cc1d93b0-b9c9-48d2-b0ac-481560a289afamanit0001<p>This error will be occurred whenever there is no value in that particular dictionary/column. We can avoid this error by using&nbsp;index function to drill down to column value. In this case instead of&nbsp;<span>pv!inactiveUserDetails.appianUsername, index(pv!inactiveUserDetails, &quot;appianUsername&quot;,null) can be used to avoid the error.</span></p><div style="clear:both;"></div>