The error reported in https://apps.opcfoundation.org/mantis/view.php?id=4127 is still happening in latest OPC UA CTT.

When no Array is defined, the test 036 produce an Error:

Test.Execute() encounted an unexpected error: TypeError: Result of expression near '...tampsToReturn.Both )[0]...' [null]
is not an object.
function:
file: C:/temp/CTT_1.3.340.378/NanoServer/library/Base/safeInvoke.js
line: 106
function:
file: C:/temp/CTT_1.3.340.378/NanoServer/maintree/Monitored Item Services/Monitor Value Change/Test Cases/036.js
line: 92