The requester is using the SOAP function: "getArtifactType". When executing it many times, sometimes it returns a value and sometimes it does not return anything. This error is displayed: ********************************** X-Powered-By: PHP/5.1.6 Content-type: text/html array(0) { } **********************************

Developer analysis:
I suspect something odd is happening with the Artifact Type permissions. In essence, according to the code, the only way for your requester to get such an output is for them to not have the permission to view the artifact type. Normally this should result in a SoapFault. However, there seems to be a double checking of this permission and the second check seems to be less well-handled than the first.