Hi,
I don’t know why I have to use floating node in this case. Does someone knows how to fix it? I’m using an Autodesk algorithm (Generative Design to Workspace Layout)
Thanks! 
Lists are not valid outputs for generative design. Either you need to run your graph to get rid of the empty list or you need to figure out how to reduce the list output to a single item output. If you have a specific outcome that results in an empty list for this variable then you would also need to write in a condition to handle that.
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