World: r3wp

data
 is somehow none.
The error happens in on-task-done event function:


 on-task-done: func [data /local valid out value ctype body headers 
 s e][
		either "HTTP" = copy/part data 4 [  ;<<<<<<<<<<
			;--- Non Parsed Header output ---
			write-client data
		][
			;--- Parsed Header output ---
			out: ctype: line: none

Problem solved. Thanks Doc.