PyPlot crashes Atom

I am using Julia 1.1.1 on a MacBook Pro macOS Mojave v 10.14.5
The environment to use Julia is Atom 1.39.1 x64
To plot I use PyPlot and `PyPlot.backend` = Qt5Agg

From the REPL if I do:
`x = randn(100);
plot(x)`
I get a nice window with the plot; I can close the window and everything is OK!

If I use the same 2 lines of code in a file xxxx.jl, I get the same window with the plot as well as a message :
> Julia Client Evaluation finished

but then Atom halts and leaves with a message "Atom left unexpectedly"
Did somebody encounter this behaviour? Is there a solution?
Thanks in advance.