Error with -dbackend=null (Lilypond 2.23.10)

[Paolo Prete]

Hello,

lilypond -dbackend=null foo.ly produces the following error:

GNU LilyPond 2.23.10 (running Guile 2.2)
Processing `foo.ly'
Parsing...
foo.ly:1: warning: no \version statement found, please add
\version "2.23.10"
for future compatibility
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...ERROR: In procedure ly:book-process:
In procedure module-lookup: Unbound variable: output-stencils

...any feedback for this? Thanks

P