I'm using a Table Row to Variable Loop to go through a table. It is possible, that the table is empty. The Table Row to Variable Loop Node cannot process empty tables, so I use an Empty Table Switch as a check. If the table isn't not empty, everything is fine. If it is empty, the switch correctly x-es out the top output and uses to bottom one, but somehow the loop end wants to be executed and the stream ends without finishing and following error message:
ERROR LocalNodeExecutionJob Caught "NullPointerException": null
Can you send me a screenshot of your workflow? Alternativey, what kind of loop end node are you using? I attempted to reproduce your problem, but so far it works for me.
here is a sample stream for that problem.
I think this issue was actually fixed in KNIME 2.8.1, which we pushed out just hours ago (and this is why I couldn't reproduce the problem). Would you mind updating and letting me know if the patch does indeed fix things up for you?
the patch is great! It fixes several other annoyances as well.
Thanks for the great work!