Error updating Legend. Simple script throws an error/warming

Hello, I'm trying modify the position and thick of the legend after was created. In this script:

clearvars
close all
clc

x=rand(1,10);
h=plot(x);
hold on

[hL,obj,outh]=legend(h,'Rand x');
set(hL,'Position',[0.3 0.8 0.06 0.05])

The last line throws this warning:

Warning: Error updating Legend.
 Struct contents reference from a non-struct array object.

But, the following lines doesn't throws the warning:

hL=legend(h,'Rand x');
set(hL,'Position',[0.3 0.8 0.06 0.05])

I'm changing the propierties whit the outh handles, so I have to use the 3 outputs. Itself is not a problem, and the script does all is supposed to do. Any ideas to avoid the warning? or may be is a bug. Thank you to all.