silent+redraw E749: Empty buffer

Hello.I have a simple combination of silent/redraw

command! -nargs=1 Silent
\ | exe 'silent !'.<q-args>
\ | execute ':redraw!'

If I put
exe 'silent !'.<q-args> | exe ':redraw!'

Manually it works fine.

But if I run the command I created in an empty buffer I get:

E749: Empty buffer.

What is the explanation behind that ? Does silent/redraw require buffer input somehow ?

Regards,

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