Can you please share the complete stack trace of the error, without that i don't think we can figure out the root cause behind this error. If you know the use case while logging this error try to trace it and see any additional information in the tracer log.
If you are not aware of the use case then you should probably start checking the references for D_WorkbasketsInAllMyWorkGroupInWidget data page where you are trying to access its pxResults. In this scenario it is complaining about the 4th element in this data page , where the clipboard might not have this page or invalid page. Hope this might help you to investigate further.