https://connect.hyland.com/t5/alfresco-forum/setting-a-condition-inside-of-an-execution-listener-set-variable/m-p/27795#M11931 <P>The variable QaReviews may or may not exist.&nbsp;</P><P>An execution listener created with a conditional inside.</P><P>{execution.setVariable('QaReviews',QaReviews == null ? null : QaReviews + 1 )}</P><P>This condition fails when ran (where QaReviews doesnt exist) with following error: HTTP Status 500 - Request processing failed; nested exception is org.activiti.engine.ActivitiException: Unknown property used in expression: ${execution.setVariable('QaReviews',QaReviews == null ? null : QaReviews + 1 )}</P><P>The condition should evalute to true if QaReviews == null.&nbsp; Not sure why fails.</P> Tue, 21 Sep 2021 21:30:14 GMT TomV 2021-09-21T21:30:14Z https://connect.hyland.com/t5/alfresco-forum/setting-a-condition-inside-of-an-execution-listener-set-variable/m-p/27795#M11931 <P>The variable QaReviews may or may not exist.&nbsp;</P><P>An execution listener created with a conditional inside.</P><P>{execution.setVariable('QaReviews',QaReviews == null ? null : QaReviews + 1 )}</P><P>This condition fails when ran (where QaReviews doesnt exist) with following error: HTTP Status 500 - Request processing failed; nested exception is org.activiti.engine.ActivitiException: Unknown property used in expression: ${execution.setVariable('QaReviews',QaReviews == null ? null : QaReviews + 1 )}</P><P>The condition should evalute to true if QaReviews == null.&nbsp; Not sure why fails.</P> Tue, 21 Sep 2021 21:30:14 GMT https://connect.hyland.com/t5/alfresco-forum/setting-a-condition-inside-of-an-execution-listener-set-variable/m-p/27795#M11931 TomV 2021-09-21T21:30:14Z